diff --git a/.changelog/638869f0762a4d27890507107e3989c1.json b/.changelog/638869f0762a4d27890507107e3989c1.json
new file mode 100644
index 00000000000..d2fe0d624d2
--- /dev/null
+++ b/.changelog/638869f0762a4d27890507107e3989c1.json
@@ -0,0 +1,8 @@
+{
+    "id": "638869f0-762a-4d27-8905-07107e3989c1",
+    "type": "documentation",
+    "description": "Adds support for additional retention periods to Performance Insights.",
+    "modules": [
+        "service/rds"
+    ]
+}
\ No newline at end of file
diff --git a/.changelog/d385b9c10cc14d3db1e21998db618ef2.json b/.changelog/d385b9c10cc14d3db1e21998db618ef2.json
new file mode 100644
index 00000000000..5def7bcd3f3
--- /dev/null
+++ b/.changelog/d385b9c10cc14d3db1e21998db618ef2.json
@@ -0,0 +1,8 @@
+{
+    "id": "d385b9c1-0cc1-4d3d-b1e2-1998db618ef2",
+    "type": "feature",
+    "description": "Added new features for AWS DMS version 3.4.7 that includes new endpoint settings for S3, OpenSearch, Postgres, SQLServer and Oracle.",
+    "modules": [
+        "service/databasemigrationservice"
+    ]
+}
\ No newline at end of file
diff --git a/service/databasemigrationservice/api_op_DescribeFleetAdvisorDatabases.go b/service/databasemigrationservice/api_op_DescribeFleetAdvisorDatabases.go
index 664390d35ce..48e7c821cf6 100644
--- a/service/databasemigrationservice/api_op_DescribeFleetAdvisorDatabases.go
+++ b/service/databasemigrationservice/api_op_DescribeFleetAdvisorDatabases.go
@@ -34,25 +34,23 @@ type DescribeFleetAdvisorDatabasesInput struct {
 	// only those databases that meet the filter criteria:
 	//
 	// * database-id – The ID of
-	// the database, for example d4610ac5-e323-4ad9-bc50-eaf7249dfe9d.
+	// the database.
 	//
-	// * database-name
-	// – The name of the database.
+	// * database-name – The name of the database.
 	//
-	// * database-engine – The name of the database
-	// engine.
+	// * database-engine –
+	// The name of the database engine.
 	//
-	// * server-ip-address – The IP address of the database server.
+	// * server-ip-address – The IP address of the
+	// database server.
 	//
-	// *
-	// database-ip-address – The IP address of the database.
+	// * database-ip-address – The IP address of the database.
 	//
-	// * collector-name – The
-	// name of the associated Fleet Advisor collector.
+	// *
+	// collector-name – The name of the associated Fleet Advisor collector.
 	//
-	// An example is:
-	// describe-fleet-advisor-databases --filter
-	// Name="database-id",Values="d4610ac5-e323-4ad9-bc50-eaf7249dfe9d"
+	// An example
+	// is: describe-fleet-advisor-databases --filter Name="database-id",Values="45"
 	Filters []types.Filter
 
 	// Sets the maximum number of records returned in the response.
diff --git a/service/databasemigrationservice/deserializers.go b/service/databasemigrationservice/deserializers.go
index f6ee0e208a0..544a5592369 100644
--- a/service/databasemigrationservice/deserializers.go
+++ b/service/databasemigrationservice/deserializers.go
@@ -9767,6 +9767,15 @@ func awsAwsjson11_deserializeDocumentElasticsearchSettings(v **types.Elasticsear
 				sv.ServiceAccessRoleArn = ptr.String(jtv)
 			}
 
+		case "UseNewMappingType":
+			if value != nil {
+				jtv, ok := value.(bool)
+				if !ok {
+					return fmt.Errorf("expected BooleanOptional to be of type *bool, got %T instead", value)
+				}
+				sv.UseNewMappingType = ptr.Bool(jtv)
+			}
+
 		default:
 			_, _ = key, value
 
@@ -12241,6 +12250,15 @@ func awsAwsjson11_deserializeDocumentMicrosoftSQLServerSettings(v **types.Micros
 				sv.ServerName = ptr.String(jtv)
 			}
 
+		case "TrimSpaceInChar":
+			if value != nil {
+				jtv, ok := value.(bool)
+				if !ok {
+					return fmt.Errorf("expected BooleanOptional to be of type *bool, got %T instead", value)
+				}
+				sv.TrimSpaceInChar = ptr.Bool(jtv)
+			}
+
 		case "UseBcpFullLoad":
 			if value != nil {
 				jtv, ok := value.(bool)
@@ -13073,6 +13091,15 @@ func awsAwsjson11_deserializeDocumentOracleSettings(v **types.OracleSettings, va
 				sv.StandbyDelayTime = ptr.Int32(int32(i64))
 			}
 
+		case "TrimSpaceInChar":
+			if value != nil {
+				jtv, ok := value.(bool)
+				if !ok {
+					return fmt.Errorf("expected BooleanOptional to be of type *bool, got %T instead", value)
+				}
+				sv.TrimSpaceInChar = ptr.Bool(jtv)
+			}
+
 		case "UseAlternateFolderForOnline":
 			if value != nil {
 				jtv, ok := value.(bool)
@@ -13659,6 +13686,15 @@ func awsAwsjson11_deserializeDocumentPostgreSQLSettings(v **types.PostgreSQLSett
 				sv.SlotName = ptr.String(jtv)
 			}
 
+		case "TrimSpaceInChar":
+			if value != nil {
+				jtv, ok := value.(bool)
+				if !ok {
+					return fmt.Errorf("expected BooleanOptional to be of type *bool, got %T instead", value)
+				}
+				sv.TrimSpaceInChar = ptr.Bool(jtv)
+			}
+
 		case "Username":
 			if value != nil {
 				jtv, ok := value.(string)
@@ -16043,6 +16079,15 @@ func awsAwsjson11_deserializeDocumentS3Settings(v **types.S3Settings, value inte
 				sv.AddColumnName = ptr.Bool(jtv)
 			}
 
+		case "AddTrailingPaddingCharacter":
+			if value != nil {
+				jtv, ok := value.(bool)
+				if !ok {
+					return fmt.Errorf("expected BooleanOptional to be of type *bool, got %T instead", value)
+				}
+				sv.AddTrailingPaddingCharacter = ptr.Bool(jtv)
+			}
+
 		case "BucketFolder":
 			if value != nil {
 				jtv, ok := value.(string)
@@ -16266,6 +16311,15 @@ func awsAwsjson11_deserializeDocumentS3Settings(v **types.S3Settings, value inte
 				sv.EncryptionMode = types.EncryptionModeValue(jtv)
 			}
 
+		case "ExpectedBucketOwner":
+			if value != nil {
+				jtv, ok := value.(string)
+				if !ok {
+					return fmt.Errorf("expected String to be of type string, got %T instead", value)
+				}
+				sv.ExpectedBucketOwner = ptr.String(jtv)
+			}
+
 		case "ExternalTableDefinition":
 			if value != nil {
 				jtv, ok := value.(string)
diff --git a/service/databasemigrationservice/serializers.go b/service/databasemigrationservice/serializers.go
index dbbd4d21492..4eff441c0fe 100644
--- a/service/databasemigrationservice/serializers.go
+++ b/service/databasemigrationservice/serializers.go
@@ -3657,6 +3657,11 @@ func awsAwsjson11_serializeDocumentElasticsearchSettings(v *types.ElasticsearchS
 		ok.String(*v.ServiceAccessRoleArn)
 	}
 
+	if v.UseNewMappingType != nil {
+		ok := object.Key("UseNewMappingType")
+		ok.Boolean(*v.UseNewMappingType)
+	}
+
 	return nil
 }
 
@@ -4105,6 +4110,11 @@ func awsAwsjson11_serializeDocumentMicrosoftSQLServerSettings(v *types.Microsoft
 		ok.String(*v.ServerName)
 	}
 
+	if v.TrimSpaceInChar != nil {
+		ok := object.Key("TrimSpaceInChar")
+		ok.Boolean(*v.TrimSpaceInChar)
+	}
+
 	if v.UseBcpFullLoad != nil {
 		ok := object.Key("UseBcpFullLoad")
 		ok.Boolean(*v.UseBcpFullLoad)
@@ -4495,6 +4505,11 @@ func awsAwsjson11_serializeDocumentOracleSettings(v *types.OracleSettings, value
 		ok.Integer(*v.StandbyDelayTime)
 	}
 
+	if v.TrimSpaceInChar != nil {
+		ok := object.Key("TrimSpaceInChar")
+		ok.Boolean(*v.TrimSpaceInChar)
+	}
+
 	if v.UseAlternateFolderForOnline != nil {
 		ok := object.Key("UseAlternateFolderForOnline")
 		ok.Boolean(*v.UseAlternateFolderForOnline)
@@ -4617,6 +4632,11 @@ func awsAwsjson11_serializeDocumentPostgreSQLSettings(v *types.PostgreSQLSetting
 		ok.String(*v.SlotName)
 	}
 
+	if v.TrimSpaceInChar != nil {
+		ok := object.Key("TrimSpaceInChar")
+		ok.Boolean(*v.TrimSpaceInChar)
+	}
+
 	if v.Username != nil {
 		ok := object.Key("Username")
 		ok.String(*v.Username)
@@ -4833,6 +4853,11 @@ func awsAwsjson11_serializeDocumentS3Settings(v *types.S3Settings, value smithyj
 		ok.Boolean(*v.AddColumnName)
 	}
 
+	if v.AddTrailingPaddingCharacter != nil {
+		ok := object.Key("AddTrailingPaddingCharacter")
+		ok.Boolean(*v.AddTrailingPaddingCharacter)
+	}
+
 	if v.BucketFolder != nil {
 		ok := object.Key("BucketFolder")
 		ok.String(*v.BucketFolder)
@@ -4948,6 +4973,11 @@ func awsAwsjson11_serializeDocumentS3Settings(v *types.S3Settings, value smithyj
 		ok.String(string(v.EncryptionMode))
 	}
 
+	if v.ExpectedBucketOwner != nil {
+		ok := object.Key("ExpectedBucketOwner")
+		ok.String(*v.ExpectedBucketOwner)
+	}
+
 	if v.ExternalTableDefinition != nil {
 		ok := object.Key("ExternalTableDefinition")
 		ok.String(*v.ExternalTableDefinition)
diff --git a/service/databasemigrationservice/types/types.go b/service/databasemigrationservice/types/types.go
index 1a7eeb73232..f607a64766a 100644
--- a/service/databasemigrationservice/types/types.go
+++ b/service/databasemigrationservice/types/types.go
@@ -387,6 +387,11 @@ type ElasticsearchSettings struct {
 	// all records fail in the last 10 minutes, the full load operation stops.
 	FullLoadErrorPercentage *int32
 
+	// Set this option to true for DMS to migrate documentation using the documentation
+	// type _doc. OpenSearch and an Elasticsearch cluster only support the _doc
+	// documentation type in versions 7. x and later. The default value is false.
+	UseNewMappingType *bool
+
 	noSmithyDocumentSerde
 }
 
@@ -1086,6 +1091,10 @@ type MicrosoftSQLServerSettings struct {
 	// Fully qualified domain name of the endpoint.
 	ServerName *string
 
+	// Use the TrimSpaceInChar source endpoint setting to trim data on CHAR and NCHAR
+	// data types during migration. The default value is true.
+	TrimSpaceInChar *bool
+
 	// Use this to attribute to transfer data for full-load operations using BCP. When
 	// the target table contains an identity column that does not exist in the source
 	// table, you must disable the use BCP for loading table option.
@@ -1542,6 +1551,10 @@ type OracleSettings struct {
 	// need to connect to an active database that might be in production.
 	StandbyDelayTime *int32
 
+	// Use the TrimSpaceInChar source endpoint setting to trim data on CHAR and NCHAR
+	// data types during migration. The default value is true.
+	TrimSpaceInChar *bool
+
 	// Set this attribute to true in order to use the Binary Reader to capture change
 	// data for an Amazon RDS for Oracle as the source. This tells the DMS instance to
 	// use any specified prefix replacement to access all online redo logs.
@@ -1760,6 +1773,10 @@ type PostgreSQLSettings struct {
 	// (https://docs.aws.amazon.com/dms/latest/APIReference/API_ModifyReplicationTask.html).
 	SlotName *string
 
+	// Use the TrimSpaceInChar source endpoint setting to trim data on CHAR and NCHAR
+	// data types during migration. The default value is true.
+	TrimSpaceInChar *bool
+
 	// Endpoint connection user name.
 	Username *string
 
@@ -2357,18 +2374,44 @@ type ReplicationTask struct {
 	// The reason the replication task was stopped. This response parameter can return
 	// one of the following values:
 	//
-	// * "STOP_REASON_FULL_LOAD_COMPLETED" – Full-load
-	// migration completed.
+	// * "Stop Reason NORMAL"
+	//
+	// * "Stop Reason
+	// RECOVERABLE_ERROR"
+	//
+	// * "Stop Reason FATAL_ERROR"
+	//
+	// * "Stop Reason
+	// FULL_LOAD_ONLY_FINISHED"
+	//
+	// * "Stop Reason STOPPED_AFTER_FULL_LOAD" – Full load
+	// completed, with cached changes not applied
+	//
+	// * "Stop Reason
+	// STOPPED_AFTER_CACHED_EVENTS" – Full load completed, with cached changes
+	// applied
 	//
-	// * "STOP_REASON_CACHED_CHANGES_APPLIED" – Change data
-	// capture (CDC) load completed.
+	// * "Stop Reason EXPRESS_LICENSE_LIMITS_REACHED"
 	//
-	// * "STOP_REASON_CACHED_CHANGES_NOT_APPLIED" – In a
-	// full-load and CDC migration, the full load stopped as specified before starting
-	// the CDC migration.
+	// * "Stop Reason
+	// STOPPED_AFTER_DDL_APPLY" – User-defined stop task after DDL applied
 	//
-	// * "STOP_REASON_SERVER_TIME" – The migration stopped at the
-	// specified server time.
+	// * "Stop
+	// Reason STOPPED_DUE_TO_LOW_MEMORY"
+	//
+	// * "Stop Reason STOPPED_DUE_TO_LOW_DISK"
+	//
+	// *
+	// "Stop Reason STOPPED_AT_SERVER_TIME" – User-defined server time for stopping
+	// task
+	//
+	// * "Stop Reason STOPPED_AT_COMMIT_TIME" – User-defined commit time for
+	// stopping task
+	//
+	// * "Stop Reason RECONFIGURATION_RESTART"
+	//
+	// * "Stop Reason
+	// RECYCLE_TASK"
 	StopReason *string
 
 	// Table mappings specified in the task.
@@ -2628,6 +2671,10 @@ type S3Settings struct {
 	// values are true, false, y, and n.
 	AddColumnName *bool
 
+	// Use the S3 target endpoint setting AddTrailingPaddingCharacter to add padding on
+	// string data. The default value is false.
+	AddTrailingPaddingCharacter *bool
+
 	// An optional parameter to set a folder name in the S3 bucket. If provided, tables
 	// are created in the path  bucketFolder/schema_name/table_name/. If this parameter
 	// isn't specified, then the path used is  schema_name/table_name/.
@@ -2856,6 +2903,13 @@ type S3Settings struct {
 	// * s3:DeleteBucketPolicy
 	EncryptionMode EncryptionModeValue
 
+	// To specify a bucket owner and prevent sniping, you can use the
+	// ExpectedBucketOwner endpoint setting. Example:
+	// --s3-settings='{"ExpectedBucketOwner": "AWS_Account_ID"}' When you make a
+	// request to test a connection or perform a migration, S3 checks the account ID of
+	// the bucket owner against the specified parameter.
+	ExpectedBucketOwner *string
+
 	// Specifies how tables are defined in the S3 source files only.
 	ExternalTableDefinition *string
 
diff --git a/service/rds/api_op_BacktrackDBCluster.go b/service/rds/api_op_BacktrackDBCluster.go
index 90bae796758..b08319c2715 100644
--- a/service/rds/api_op_BacktrackDBCluster.go
+++ b/service/rds/api_op_BacktrackDBCluster.go
@@ -14,7 +14,7 @@ import (
 // Backtracks a DB cluster to a specific time, without creating a new DB cluster.
 // For more information on backtracking, see  Backtracking an Aurora DB Cluster
 // (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Managing.Backtrack.html)
-// in the Amazon Aurora User Guide. This action only applies to Aurora MySQL DB
+// in the Amazon Aurora User Guide. This action applies only to Aurora MySQL DB
 // clusters.
 func (c *Client) BacktrackDBCluster(ctx context.Context, params *BacktrackDBClusterInput, optFns ...func(*Options)) (*BacktrackDBClusterOutput, error) {
 	if params == nil {
diff --git a/service/rds/api_op_CopyDBClusterSnapshot.go b/service/rds/api_op_CopyDBClusterSnapshot.go
index c4d3e19c638..6039ec55dab 100644
--- a/service/rds/api_op_CopyDBClusterSnapshot.go
+++ b/service/rds/api_op_CopyDBClusterSnapshot.go
@@ -17,7 +17,7 @@ import (
 // manual DB cluster snapshot, SourceDBClusterSnapshotIdentifier must be the Amazon
 // Resource Name (ARN) of the shared DB cluster snapshot. You can copy an encrypted
 // DB cluster snapshot from another Amazon Web Services Region. In that case, the
-// Amazon Web Services Region where you call the CopyDBClusterSnapshot action is
+// Amazon Web Services Region where you call the CopyDBClusterSnapshot operation is
 // the destination Amazon Web Services Region for the encrypted DB cluster snapshot
 // to be copied to. To copy an encrypted DB cluster snapshot from another Amazon
 // Web Services Region, you must provide the following values:
@@ -27,60 +27,21 @@ import (
 // identifier for the key to use to encrypt the copy of the DB cluster snapshot in
 // the destination Amazon Web Services Region.
 //
-// * PreSignedUrl - A URL that
-// contains a Signature Version 4 signed request for the CopyDBClusterSnapshot
-// action to be called in the source Amazon Web Services Region where the DB
-// cluster snapshot is copied from. The pre-signed URL must be a valid request for
-// the CopyDBClusterSnapshot API action that can be executed in the source Amazon
-// Web Services Region that contains the encrypted DB cluster snapshot to be
-// copied. The pre-signed URL request must contain the following parameter
-// values:
+// * TargetDBClusterSnapshotIdentifier
+// - The identifier for the new copy of the DB cluster snapshot in the destination
+// Amazon Web Services Region.
 //
-// * KmsKeyId - The Amazon Web Services KMS key identifier for the KMS key
-// to use to encrypt the copy of the DB cluster snapshot in the destination Amazon
-// Web Services Region. This is the same identifier for both the
-// CopyDBClusterSnapshot action that is called in the destination Amazon Web
-// Services Region, and the action contained in the pre-signed URL.
+// * SourceDBClusterSnapshotIdentifier - The DB
+// cluster snapshot identifier for the encrypted DB cluster snapshot to be copied.
+// This identifier must be in the ARN format for the source Amazon Web Services
+// Region and is the same value as the SourceDBClusterSnapshotIdentifier in the
+// presigned URL.
 //
-// *
-// DestinationRegion - The name of the Amazon Web Services Region that the DB
-// cluster snapshot is to be created in.
-//
-// * SourceDBClusterSnapshotIdentifier - The
-// DB cluster snapshot identifier for the encrypted DB cluster snapshot to be
-// copied. This identifier must be in the Amazon Resource Name (ARN) format for the
-// source Amazon Web Services Region. For example, if you are copying an encrypted
-// DB cluster snapshot from the us-west-2 Amazon Web Services Region, then your
-// SourceDBClusterSnapshotIdentifier looks like the following example:
-// arn:aws:rds:us-west-2:123456789012:cluster-snapshot:aurora-cluster1-snapshot-20161115.
-//
-// To
-// learn how to generate a Signature Version 4 signed request, see  Authenticating
-// Requests: Using Query Parameters (Amazon Web Services Signature Version 4)
-// (https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html)
-// and  Signature Version 4 Signing Process
-// (https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html). If you
-// are using an Amazon Web Services SDK tool or the CLI, you can specify
-// SourceRegion (or --source-region for the CLI) instead of specifying PreSignedUrl
-// manually. Specifying SourceRegion autogenerates a pre-signed URL that is a valid
-// request for the operation that can be executed in the source Amazon Web Services
-// Region.
-//
-// * TargetDBClusterSnapshotIdentifier - The identifier for the new copy
-// of the DB cluster snapshot in the destination Amazon Web Services Region.
-//
-// *
-// SourceDBClusterSnapshotIdentifier - The DB cluster snapshot identifier for the
-// encrypted DB cluster snapshot to be copied. This identifier must be in the ARN
-// format for the source Amazon Web Services Region and is the same value as the
-// SourceDBClusterSnapshotIdentifier in the pre-signed URL.
-//
-// To cancel the copy
-// operation once it is in progress, delete the target DB cluster snapshot
-// identified by TargetDBClusterSnapshotIdentifier while that DB cluster snapshot
-// is in "copying" status. For more information on copying encrypted Amazon Aurora
-// DB cluster snapshots from one Amazon Web Services Region to another, see
-// Copying a Snapshot
+// To cancel the copy operation once it is in progress, delete the
+// target DB cluster snapshot identified by TargetDBClusterSnapshotIdentifier while
+// that DB cluster snapshot is in "copying" status. For more information on copying
+// encrypted Amazon Aurora DB cluster snapshots from one Amazon Web Services Region
+// to another, see  Copying a Snapshot
 // (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/USER_CopySnapshot.html)
 // in the Amazon Aurora User Guide. For more information on Amazon Aurora DB
 // clusters, see  What is Amazon Aurora?
@@ -168,33 +129,36 @@ type CopyDBClusterSnapshotInput struct {
 	// value for the KmsKeyId parameter, an error is returned.
 	KmsKeyId *string
 
-	// The URL that contains a Signature Version 4 signed request for the
-	// CopyDBClusterSnapshot API action in the Amazon Web Services Region that contains
-	// the source DB cluster snapshot to copy. The PreSignedUrl parameter must be used
-	// when copying an encrypted DB cluster snapshot from another Amazon Web Services
-	// Region. Don't specify PreSignedUrl when you are copying an encrypted DB cluster
-	// snapshot in the same Amazon Web Services Region. The pre-signed URL must be a
-	// valid request for the CopyDBClusterSnapshot API action that can be executed in
-	// the source Amazon Web Services Region that contains the encrypted DB cluster
-	// snapshot to be copied. The pre-signed URL request must contain the following
-	// parameter values:
+	// When you are copying a DB cluster snapshot from one Amazon Web Services GovCloud
+	// (US) Region to another, the URL that contains a Signature Version 4 signed
+	// request for the CopyDBClusterSnapshot API operation in the Amazon Web Services
+	// Region that contains the source DB cluster snapshot to copy. Use the
+	// PreSignedUrl parameter when copying an encrypted DB cluster snapshot from
+	// another Amazon Web Services Region. Don't specify PreSignedUrl when copying an
+	// encrypted DB cluster snapshot in the same Amazon Web Services Region. This
+	// setting applies only to Amazon Web Services GovCloud (US) Regions. It's ignored
+	// in other Amazon Web Services Regions. The presigned URL must be a valid request
+	// for the CopyDBClusterSnapshot API operation that can run in the source Amazon
+	// Web Services Region that contains the encrypted DB cluster snapshot to copy. The
+	// presigned URL request must contain the following parameter values:
 	//
-	// * KmsKeyId - The Amazon Web Services KMS key identifier for
-	// the KMS key to use to encrypt the copy of the DB cluster snapshot in the
-	// destination Amazon Web Services Region. This is the same identifier for both the
-	// CopyDBClusterSnapshot action that is called in the destination Amazon Web
-	// Services Region, and the action contained in the pre-signed URL.
+	// * KmsKeyId -
+	// The KMS key identifier for the KMS key to use to encrypt the copy of the DB
+	// cluster snapshot in the destination Amazon Web Services Region. This is the same
+	// identifier for both the CopyDBClusterSnapshot operation that is called in the
+	// destination Amazon Web Services Region, and the operation contained in the
+	// presigned URL.
 	//
-	// *
-	// DestinationRegion - The name of the Amazon Web Services Region that the DB
-	// cluster snapshot is to be created in.
+	// * DestinationRegion - The name of the Amazon Web Services Region
+	// that the DB cluster snapshot is to be created in.
 	//
-	// * SourceDBClusterSnapshotIdentifier - The
-	// DB cluster snapshot identifier for the encrypted DB cluster snapshot to be
-	// copied. This identifier must be in the Amazon Resource Name (ARN) format for the
-	// source Amazon Web Services Region. For example, if you are copying an encrypted
-	// DB cluster snapshot from the us-west-2 Amazon Web Services Region, then your
-	// SourceDBClusterSnapshotIdentifier looks like the following example:
+	// *
+	// SourceDBClusterSnapshotIdentifier - The DB cluster snapshot identifier for the
+	// encrypted DB cluster snapshot to be copied. This identifier must be in the
+	// Amazon Resource Name (ARN) format for the source Amazon Web Services Region. For
+	// example, if you are copying an encrypted DB cluster snapshot from the us-west-2
+	// Amazon Web Services Region, then your SourceDBClusterSnapshotIdentifier looks
+	// like the following example:
 	// arn:aws:rds:us-west-2:123456789012:cluster-snapshot:aurora-cluster1-snapshot-20161115.
 	//
 	// To
@@ -205,9 +169,8 @@ type CopyDBClusterSnapshotInput struct {
 	// (https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html). If you
 	// are using an Amazon Web Services SDK tool or the CLI, you can specify
 	// SourceRegion (or --source-region for the CLI) instead of specifying PreSignedUrl
-	// manually. Specifying SourceRegion autogenerates a pre-signed URL that is a valid
-	// request for the operation that can be executed in the source Amazon Web Services
-	// Region.
+	// manually. Specifying SourceRegion autogenerates a presigned URL that is a valid
+	// request for the operation that can run in the source Amazon Web Services Region.
 	PreSignedUrl *string
 
 	// The AWS region the resource is in. The presigned URL will be created with this
diff --git a/service/rds/api_op_CopyDBSnapshot.go b/service/rds/api_op_CopyDBSnapshot.go
index 47a12b6bfba..5ebf7bd970a 100644
--- a/service/rds/api_op_CopyDBSnapshot.go
+++ b/service/rds/api_op_CopyDBSnapshot.go
@@ -16,8 +16,8 @@ import (
 // Copies the specified DB snapshot. The source DB snapshot must be in the
 // available state. You can copy a snapshot from one Amazon Web Services Region to
 // another. In that case, the Amazon Web Services Region where you call the
-// CopyDBSnapshot action is the destination Amazon Web Services Region for the DB
-// snapshot copy. This command doesn't apply to RDS Custom. For more information
+// CopyDBSnapshot operation is the destination Amazon Web Services Region for the
+// DB snapshot copy. This command doesn't apply to RDS Custom. For more information
 // about copying snapshots, see Copying a DB Snapshot
 // (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_CopySnapshot.html#USER_CopyDBSnapshot)
 // in the Amazon RDS User Guide.
@@ -48,11 +48,10 @@ type CopyDBSnapshotInput struct {
 	// If you are copying from a shared manual DB snapshot, this parameter must be the
 	// Amazon Resource Name (ARN) of the shared DB snapshot. If you are copying an
 	// encrypted snapshot this parameter must be in the ARN format for the source
-	// Amazon Web Services Region, and must match the SourceDBSnapshotIdentifier in the
-	// PreSignedUrl parameter. Constraints:
+	// Amazon Web Services Region. Constraints:
 	//
-	// * Must specify a valid system snapshot in
-	// the "available" state.
+	// * Must specify a valid system snapshot
+	// in the "available" state.
 	//
 	// Example: rds:mydb-2012-04-02-00-01 Example:
 	// arn:aws:rds:us-west-2:123456789012:snapshot:mysql-instance1-snapshot-20130805
@@ -109,36 +108,39 @@ type CopyDBSnapshotInput struct {
 	// in the Amazon RDS User Guide.
 	OptionGroupName *string
 
-	// The URL that contains a Signature Version 4 signed request for the
-	// CopyDBSnapshot API action in the source Amazon Web Services Region that contains
-	// the source DB snapshot to copy. You must specify this parameter when you copy an
-	// encrypted DB snapshot from another Amazon Web Services Region by using the
-	// Amazon RDS API. Don't specify PreSignedUrl when you are copying an encrypted DB
-	// snapshot in the same Amazon Web Services Region. The presigned URL must be a
-	// valid request for the CopyDBSnapshot API action that can be executed in the
-	// source Amazon Web Services Region that contains the encrypted DB snapshot to be
-	// copied. The presigned URL request must contain the following parameter
-	// values:
+	// When you are copying a snapshot from one Amazon Web Services GovCloud (US)
+	// Region to another, the URL that contains a Signature Version 4 signed request
+	// for the CopyDBSnapshot API operation in the source Amazon Web Services Region
+	// that contains the source DB snapshot to copy. This setting applies only to
+	// Amazon Web Services GovCloud (US) Regions. It's ignored in other Amazon Web
+	// Services Regions. You must specify this parameter when you copy an encrypted DB
+	// snapshot from another Amazon Web Services Region by using the Amazon RDS API.
+	// Don't specify PreSignedUrl when you are copying an encrypted DB snapshot in the
+	// same Amazon Web Services Region. The presigned URL must be a valid request for
+	// the CopyDBClusterSnapshot API operation that can run in the source Amazon Web
+	// Services Region that contains the encrypted DB cluster snapshot to copy. The
+	// presigned URL request must contain the following parameter values:
 	//
-	// * DestinationRegion - The Amazon Web Services Region that the encrypted
-	// DB snapshot is copied to. This Amazon Web Services Region is the same one where
-	// the CopyDBSnapshot action is called that contains this presigned URL. For
+	// *
+	// DestinationRegion - The Amazon Web Services Region that the encrypted DB
+	// snapshot is copied to. This Amazon Web Services Region is the same one where the
+	// CopyDBSnapshot operation is called that contains this presigned URL. For
 	// example, if you copy an encrypted DB snapshot from the us-west-2 Amazon Web
 	// Services Region to the us-east-1 Amazon Web Services Region, then you call the
-	// CopyDBSnapshot action in the us-east-1 Amazon Web Services Region and provide a
-	// presigned URL that contains a call to the CopyDBSnapshot action in the us-west-2
-	// Amazon Web Services Region. For this example, the DestinationRegion in the
-	// presigned URL must be set to the us-east-1 Amazon Web Services Region.
+	// CopyDBSnapshot operation in the us-east-1 Amazon Web Services Region and provide
+	// a presigned URL that contains a call to the CopyDBSnapshot operation in the
+	// us-west-2 Amazon Web Services Region. For this example, the DestinationRegion in
+	// the presigned URL must be set to the us-east-1 Amazon Web Services Region.
 	//
 	// *
-	// KmsKeyId - The Amazon Web Services KMS key identifier for the KMS key to use to
-	// encrypt the copy of the DB snapshot in the destination Amazon Web Services
-	// Region. This is the same identifier for both the CopyDBSnapshot action that is
-	// called in the destination Amazon Web Services Region, and the action contained
-	// in the presigned URL.
+	// KmsKeyId - The KMS key identifier for the KMS key to use to encrypt the copy of
+	// the DB snapshot in the destination Amazon Web Services Region. This is the same
+	// identifier for both the CopyDBSnapshot operation that is called in the
+	// destination Amazon Web Services Region, and the operation contained in the
+	// presigned URL.
 	//
-	// * SourceDBSnapshotIdentifier - The DB snapshot identifier
-	// for the encrypted snapshot to be copied. This identifier must be in the Amazon
+	// * SourceDBSnapshotIdentifier - The DB snapshot identifier for
+	// the encrypted snapshot to be copied. This identifier must be in the Amazon
 	// Resource Name (ARN) format for the source Amazon Web Services Region. For
 	// example, if you are copying an encrypted DB snapshot from the us-west-2 Amazon
 	// Web Services Region, then your SourceDBSnapshotIdentifier looks like the
@@ -153,9 +155,8 @@ type CopyDBSnapshotInput struct {
 	// (https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html). If you
 	// are using an Amazon Web Services SDK tool or the CLI, you can specify
 	// SourceRegion (or --source-region for the CLI) instead of specifying PreSignedUrl
-	// manually. Specifying SourceRegion autogenerates a pre-signed URL that is a valid
-	// request for the operation that can be executed in the source Amazon Web Services
-	// Region.
+	// manually. Specifying SourceRegion autogenerates a presigned URL that is a valid
+	// request for the operation that can run in the source Amazon Web Services Region.
 	PreSignedUrl *string
 
 	// The AWS region the resource is in. The presigned URL will be created with this
diff --git a/service/rds/api_op_CreateDBCluster.go b/service/rds/api_op_CreateDBCluster.go
index efbe3072b4b..b5c71940080 100644
--- a/service/rds/api_op_CreateDBCluster.go
+++ b/service/rds/api_op_CreateDBCluster.go
@@ -16,9 +16,7 @@ import (
 // Creates a new Amazon Aurora DB cluster or Multi-AZ DB cluster. You can use the
 // ReplicationSourceIdentifier parameter to create an Amazon Aurora DB cluster as a
 // read replica of another DB cluster or Amazon RDS MySQL or PostgreSQL DB
-// instance. For cross-Region replication where the DB cluster identified by
-// ReplicationSourceIdentifier is encrypted, also specify the PreSignedUrl
-// parameter. For more information on Amazon Aurora, see  What is Amazon Aurora?
+// instance. For more information on Amazon Aurora, see  What is Amazon Aurora?
 // (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/CHAP_AuroraOverview.html)
 // in the Amazon Aurora User Guide. For more information on Multi-AZ DB clusters,
 // see  Multi-AZ deployments with two readable standby DB instances
@@ -213,7 +211,7 @@ type CreateDBClusterInput struct {
 	// and Access Management (IAM) accounts to database accounts. By default, mapping
 	// isn't enabled. For more information, see  IAM Database Authentication
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/UsingWithRDS.IAMDBAuth.html)
-	// in the Amazon Aurora User Guide.. Valid for: Aurora DB clusters only
+	// in the Amazon Aurora User Guide. Valid for: Aurora DB clusters only
 	EnableIAMDatabaseAuthentication *bool
 
 	// A value that indicates whether to turn on Performance Insights for the DB
@@ -228,7 +226,8 @@ type CreateDBClusterInput struct {
 	// and higher 2.x versions. The global engine mode isn't required for Aurora MySQL
 	// version 1.22 and higher 1.x versions, and global engine mode isn't required for
 	// any 2.x versions. The multimaster engine mode only applies for DB clusters
-	// created with Aurora MySQL version 5.6.10a. For Aurora PostgreSQL, the global
+	// created with Aurora MySQL version 5.6.10a. The serverless engine mode only
+	// applies for Aurora Serverless v1 DB clusters. For Aurora PostgreSQL, the global
 	// engine mode isn't required, and both the parallelquery and the multimaster
 	// engine modes currently aren't supported. Limitations and requirements apply to
 	// some DB engine modes. For more information, see the following sections in the
@@ -238,6 +237,10 @@ type CreateDBClusterInput struct {
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-serverless.html#aurora-serverless.limitations)
 	//
 	// *
+	// Requirements for Aurora Serverless v2
+	// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-serverless-v2.requirements.html)
+	//
+	// *
 	// Limitations of Parallel Query
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-mysql-parallel-query.html#aurora-mysql-parallel-query-limitations)
 	//
@@ -370,8 +373,30 @@ type CreateDBClusterInput struct {
 	// Valid for: Multi-AZ DB clusters only
 	PerformanceInsightsKMSKeyId *string
 
-	// The amount of time, in days, to retain Performance Insights data. Valid values
-	// are 7 or 731 (2 years). Valid for: Multi-AZ DB clusters only
+	// The number of days to retain Performance Insights data. The default is 7 days.
+	// The following values are valid:
+	//
+	// * 7
+	//
+	// * month * 31, where month is a number of
+	// months from 1-23
+	//
+	// * 731
+	//
+	// For example, the following values are valid:
+	//
+	// * 93 (3
+	// months * 31)
+	//
+	// * 341 (11 months * 31)
+	//
+	// * 589 (19 months * 31)
+	//
+	// * 731
+	//
+	// If you
+	// specify a retention period such as 94, which isn't a valid value, RDS issues an
+	// error. Valid for: Multi-AZ DB clusters only
 	PerformanceInsightsRetentionPeriod *int32
 
 	// The port number on which the instances in the DB cluster accept connections. RDS
@@ -380,43 +405,44 @@ type CreateDBClusterInput struct {
 	// for: Aurora DB clusters and Multi-AZ DB clusters
 	Port *int32
 
-	// A URL that contains a Signature Version 4 signed request for the CreateDBCluster
-	// action to be called in the source Amazon Web Services Region where the DB
-	// cluster is replicated from. Specify PreSignedUrl only when you are performing
-	// cross-Region replication from an encrypted DB cluster. The pre-signed URL must
-	// be a valid request for the CreateDBCluster API action that can be executed in
-	// the source Amazon Web Services Region that contains the encrypted DB cluster to
-	// be copied. The pre-signed URL request must contain the following parameter
+	// When you are replicating a DB cluster from one Amazon Web Services GovCloud (US)
+	// Region to another, an URL that contains a Signature Version 4 signed request for
+	// the CreateDBCluster operation to be called in the source Amazon Web Services
+	// Region where the DB cluster is replicated from. Specify PreSignedUrl only when
+	// you are performing cross-Region replication from an encrypted DB cluster. The
+	// presigned URL must be a valid request for the CreateDBCluster API operation that
+	// can run in the source Amazon Web Services Region that contains the encrypted DB
+	// cluster to copy. The presigned URL request must contain the following parameter
 	// values:
 	//
-	// * KmsKeyId - The Amazon Web Services KMS key identifier for the KMS key
-	// to use to encrypt the copy of the DB cluster in the destination Amazon Web
-	// Services Region. This should refer to the same KMS key for both the
-	// CreateDBCluster action that is called in the destination Amazon Web Services
-	// Region, and the action contained in the pre-signed URL.
-	//
-	// * DestinationRegion -
-	// The name of the Amazon Web Services Region that Aurora read replica will be
-	// created in.
-	//
-	// * ReplicationSourceIdentifier - The DB cluster identifier for the
-	// encrypted DB cluster to be copied. This identifier must be in the Amazon
-	// Resource Name (ARN) format for the source Amazon Web Services Region. For
-	// example, if you are copying an encrypted DB cluster from the us-west-2 Amazon
-	// Web Services Region, then your ReplicationSourceIdentifier would look like
-	// Example: arn:aws:rds:us-west-2:123456789012:cluster:aurora-cluster1.
-	//
-	// To learn
-	// how to generate a Signature Version 4 signed request, see  Authenticating
-	// Requests: Using Query Parameters (Amazon Web Services Signature Version 4)
+	// * KmsKeyId - The KMS key identifier for the KMS key to use to encrypt
+	// the copy of the DB cluster in the destination Amazon Web Services Region. This
+	// should refer to the same KMS key for both the CreateDBCluster operation that is
+	// called in the destination Amazon Web Services Region, and the operation
+	// contained in the presigned URL.
+	//
+	// * DestinationRegion - The name of the Amazon
+	// Web Services Region that Aurora read replica will be created in.
+	//
+	// *
+	// ReplicationSourceIdentifier - The DB cluster identifier for the encrypted DB
+	// cluster to be copied. This identifier must be in the Amazon Resource Name (ARN)
+	// format for the source Amazon Web Services Region. For example, if you are
+	// copying an encrypted DB cluster from the us-west-2 Amazon Web Services Region,
+	// then your ReplicationSourceIdentifier would look like Example:
+	// arn:aws:rds:us-west-2:123456789012:cluster:aurora-cluster1.
+	//
+	// To learn how to
+	// generate a Signature Version 4 signed request, see  Authenticating Requests:
+	// Using Query Parameters (Amazon Web Services Signature Version 4)
 	// (https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html)
 	// and  Signature Version 4 Signing Process
 	// (https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html). If you
 	// are using an Amazon Web Services SDK tool or the CLI, you can specify
 	// SourceRegion (or --source-region for the CLI) instead of specifying PreSignedUrl
-	// manually. Specifying SourceRegion autogenerates a pre-signed URL that is a valid
-	// request for the operation that can be executed in the source Amazon Web Services
-	// Region. Valid for: Aurora DB clusters only
+	// manually. Specifying SourceRegion autogenerates a presigned URL that is a valid
+	// request for the operation that can run in the source Amazon Web Services Region.
+	// Valid for: Aurora DB clusters only
 	PreSignedUrl *string
 
 	// The daily time range during which automated backups are created if automated
diff --git a/service/rds/api_op_CreateDBClusterEndpoint.go b/service/rds/api_op_CreateDBClusterEndpoint.go
index 4e6b394490e..0b44ba2beb9 100644
--- a/service/rds/api_op_CreateDBClusterEndpoint.go
+++ b/service/rds/api_op_CreateDBClusterEndpoint.go
@@ -12,7 +12,7 @@ import (
 )
 
 // Creates a new custom endpoint and associates it with an Amazon Aurora DB
-// cluster. This action only applies to Aurora DB clusters.
+// cluster. This action applies only to Aurora DB clusters.
 func (c *Client) CreateDBClusterEndpoint(ctx context.Context, params *CreateDBClusterEndpointInput, optFns ...func(*Options)) (*CreateDBClusterEndpointOutput, error) {
 	if params == nil {
 		params = &CreateDBClusterEndpointInput{}
diff --git a/service/rds/api_op_CreateDBClusterParameterGroup.go b/service/rds/api_op_CreateDBClusterParameterGroup.go
index 5b5036a259e..9eaa0c47381 100644
--- a/service/rds/api_op_CreateDBClusterParameterGroup.go
+++ b/service/rds/api_op_CreateDBClusterParameterGroup.go
@@ -32,7 +32,7 @@ import (
 // for a DB cluster, such as the character set for the default database defined by
 // the character_set_database parameter. You can use the Parameter Groups option of
 // the Amazon RDS console (https://console.aws.amazon.com/rds/) or the
-// DescribeDBClusterParameters action to verify that your DB cluster parameter
+// DescribeDBClusterParameters operation to verify that your DB cluster parameter
 // group has been created or modified. For more information on Amazon Aurora, see
 // What is Amazon Aurora?
 // (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/CHAP_AuroraOverview.html)
diff --git a/service/rds/api_op_CreateDBInstance.go b/service/rds/api_op_CreateDBInstance.go
index 2270390b124..03fcc67c6c2 100644
--- a/service/rds/api_op_CreateDBInstance.go
+++ b/service/rds/api_op_CreateDBInstance.go
@@ -11,7 +11,16 @@ import (
 	smithyhttp "github.com/aws/smithy-go/transport/http"
 )
 
-// Creates a new DB instance.
+// Creates a new DB instance. The new DB instance can be an RDS DB instance, or it
+// can be a DB instance in an Aurora DB cluster. For an Aurora DB cluster, you can
+// call this operation multiple times to add more than one DB instance to the
+// cluster. For more information about creating an RDS DB instance, see  Creating
+// an Amazon RDS DB instance
+// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_CreateDBInstance.html)
+// in the Amazon RDS User Guide. For more information about creating a DB instance
+// in an Aurora DB cluster, see  Creating an Amazon Aurora DB cluster
+// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.CreateInstance.html)
+// in the Amazon Aurora User Guide.
 func (c *Client) CreateDBInstance(ctx context.Context, params *CreateDBInstanceInput, optFns ...func(*Options)) (*CreateDBInstanceOutput, error) {
 	if params == nil {
 		params = &CreateDBInstanceInput{}
@@ -30,12 +39,14 @@ func (c *Client) CreateDBInstance(ctx context.Context, params *CreateDBInstanceI
 //
 type CreateDBInstanceInput struct {
 
-	// The compute and memory capacity of the DB instance, for example db.m4.large. Not
+	// The compute and memory capacity of the DB instance, for example db.m5.large. Not
 	// all DB instance classes are available in all Amazon Web Services Regions, or for
 	// all database engines. For the full list of DB instance classes, and availability
-	// for your engine, see DB Instance Class
+	// for your engine, see DB instance classes
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.DBInstanceClass.html)
-	// in the Amazon RDS User Guide.
+	// in the Amazon RDS User Guide or Aurora DB instance classes
+	// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Concepts.DBInstanceClass.html)
+	// in the Amazon Aurora User Guide.
 	//
 	// This member is required.
 	DBInstanceClass *string
@@ -227,8 +238,7 @@ type CreateDBInstanceInput struct {
 	// * Can't be set to 0 if the DB instance is a source
 	// to read replicas
 	//
-	// * Can't be set to 0 or 35 for an RDS Custom for Oracle DB
-	// instance
+	// * Can't be set to 0 for an RDS Custom for Oracle DB instance
 	BackupRetentionPeriod *int32
 
 	// Specifies where automated backups and manual snapshots are stored. Possible
@@ -375,8 +385,9 @@ type CreateDBInstanceInput struct {
 	// hyphens
 	DBParameterGroupName *string
 
-	// A list of DB security groups to associate with this DB instance. Default: The
-	// default DB security group for the database engine.
+	// A list of DB security groups to associate with this DB instance. This setting
+	// applies to the legacy EC2-Classic platform, which is no longer used to create
+	// new DB instances. Use the VpcSecurityGroupIds setting instead.
 	DBSecurityGroups []string
 
 	// A DB subnet group to associate with this DB instance. Constraints: Must match
@@ -400,11 +411,13 @@ type CreateDBInstanceInput struct {
 	// in an Active Directory Domain. For more information, see  Kerberos
 	// Authentication
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/kerberos-authentication.html)
-	// in the Amazon RDS User Guide. This setting doesn't apply to RDS Custom.
+	// in the Amazon RDS User Guide. This setting doesn't apply to RDS Custom. Amazon
+	// Aurora Not applicable. The domain is managed by the DB cluster.
 	Domain *string
 
 	// Specify the name of the IAM role to be used when making API calls to the
-	// Directory Service. This setting doesn't apply to RDS Custom.
+	// Directory Service. This setting doesn't apply to RDS Custom. Amazon Aurora Not
+	// applicable. The domain is managed by the DB cluster.
 	DomainIAMRoleName *string
 
 	// The list of log types that need to be enabled for exporting to CloudWatch Logs.
@@ -435,12 +448,12 @@ type CreateDBInstanceInput struct {
 
 	// A value that indicates whether to enable mapping of Amazon Web Services Identity
 	// and Access Management (IAM) accounts to database accounts. By default, mapping
-	// isn't enabled. This setting doesn't apply to RDS Custom or Amazon Aurora. In
-	// Aurora, mapping Amazon Web Services IAM accounts to database accounts is managed
-	// by the DB cluster. For more information, see  IAM Database Authentication for
-	// MySQL and PostgreSQL
+	// isn't enabled. For more information, see  IAM Database Authentication for MySQL
+	// and PostgreSQL
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.IAMDBAuth.html)
-	// in the Amazon RDS User Guide.
+	// in the Amazon RDS User Guide. This setting doesn't apply to RDS Custom. Amazon
+	// Aurora Not applicable. Mapping Amazon Web Services IAM accounts to database
+	// accounts is managed by the DB cluster.
 	EnableIAMDatabaseAuthentication *bool
 
 	// A value that indicates whether to enable Performance Insights for the DB
@@ -450,7 +463,7 @@ type CreateDBInstanceInput struct {
 	EnablePerformanceInsights *bool
 
 	// The version number of the database engine to use. For a list of valid engine
-	// versions, use the DescribeDBEngineVersions action. The following are the
+	// versions, use the DescribeDBEngineVersions operation. The following are the
 	// database engines and links to information about the major and minor versions
 	// that are available with Amazon RDS. Not every database engine is available for
 	// every Amazon Web Services Region. Amazon Aurora Not applicable. The version
@@ -489,7 +502,8 @@ type CreateDBInstanceInput struct {
 	// in the Amazon RDS User Guide. Constraints: For MariaDB, MySQL, Oracle, and
 	// PostgreSQL DB instances, must be a multiple between .5 and 50 of the storage
 	// amount for the DB instance. For SQL Server DB instances, must be a multiple
-	// between 1 and 50 of the storage amount for the DB instance.
+	// between 1 and 50 of the storage amount for the DB instance. Amazon Aurora Not
+	// applicable. Storage is managed by the DB cluster.
 	Iops *int32
 
 	// The Amazon Web Services KMS key identifier for an encrypted DB instance. The
@@ -510,7 +524,7 @@ type CreateDBInstanceInput struct {
 
 	// License model information for this DB instance. Valid values: license-included |
 	// bring-your-own-license | general-public-license This setting doesn't apply to
-	// RDS Custom.
+	// RDS Custom. Amazon Aurora Not applicable.
 	LicenseModel *string
 
 	// The password for the master user. The password can include any printable ASCII
@@ -542,7 +556,8 @@ type CreateDBInstanceInput struct {
 	// including limitations that apply to it, see  Managing capacity automatically
 	// with Amazon RDS storage autoscaling
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PIOPS.StorageTypes.html#USER_PIOPS.Autoscaling)
-	// in the Amazon RDS User Guide. This setting doesn't apply to RDS Custom.
+	// in the Amazon RDS User Guide. This setting doesn't apply to RDS Custom. Amazon
+	// Aurora Not applicable. Storage is managed by the DB cluster.
 	MaxAllocatedStorage *int32
 
 	// The interval, in seconds, between points when Enhanced Monitoring metrics are
@@ -564,7 +579,8 @@ type CreateDBInstanceInput struct {
 
 	// A value that indicates whether the DB instance is a Multi-AZ deployment. You
 	// can't set the AvailabilityZone parameter if the DB instance is a Multi-AZ
-	// deployment. This setting doesn't apply to RDS Custom.
+	// deployment. This setting doesn't apply to RDS Custom. Amazon Aurora Not
+	// applicable. DB instance Availability Zones (AZs) are managed by the DB cluster.
 	MultiAZ *bool
 
 	// The name of the NCHAR character set for the Oracle DB instance. This parameter
@@ -589,7 +605,8 @@ type CreateDBInstanceInput struct {
 	// specified option group. Permanent options, such as the TDE option for Oracle
 	// Advanced Security TDE, can't be removed from an option group. Also, that option
 	// group can't be removed from a DB instance after it is associated with a DB
-	// instance. This setting doesn't apply to RDS Custom.
+	// instance. This setting doesn't apply to RDS Custom. Amazon Aurora Not
+	// applicable.
 	OptionGroupName *string
 
 	// The Amazon Web Services KMS key identifier for encryption of Performance
@@ -601,8 +618,30 @@ type CreateDBInstanceInput struct {
 	// This setting doesn't apply to RDS Custom.
 	PerformanceInsightsKMSKeyId *string
 
-	// The amount of time, in days, to retain Performance Insights data. Valid values
-	// are 7 or 731 (2 years). This setting doesn't apply to RDS Custom.
+	// The number of days to retain Performance Insights data. The default is 7 days.
+	// The following values are valid:
+	//
+	// * 7
+	//
+	// * month * 31, where month is a number of
+	// months from 1-23
+	//
+	// * 731
+	//
+	// For example, the following values are valid:
+	//
+	// * 93 (3
+	// months * 31)
+	//
+	// * 341 (11 months * 31)
+	//
+	// * 589 (19 months * 31)
+	//
+	// * 731
+	//
+	// If you
+	// specify a retention period such as 94, which isn't a valid value, RDS issues an
+	// error. This setting doesn't apply to RDS Custom.
 	PerformanceInsightsRetentionPeriod *int32
 
 	// The port number on which the database accepts connections. MySQL Default: 3306
@@ -643,7 +682,8 @@ type CreateDBInstanceInput struct {
 	PreferredMaintenanceWindow *string
 
 	// The number of CPU cores and the number of threads per core for the DB instance
-	// class of the DB instance. This setting doesn't apply to RDS Custom.
+	// class of the DB instance. This setting doesn't apply to RDS Custom. Amazon
+	// Aurora Not applicable.
 	ProcessorFeatures []types.ProcessorFeature
 
 	// A value that specifies the order in which an Aurora Replica is promoted to the
@@ -694,13 +734,15 @@ type CreateDBInstanceInput struct {
 	// Specifies the storage type to be associated with the DB instance. Valid values:
 	// standard | gp2 | io1 If you specify io1, you must also include a value for the
 	// Iops parameter. Default: io1 if the Iops parameter is specified, otherwise gp2
+	// Amazon Aurora Not applicable. Storage is managed by the DB cluster.
 	StorageType *string
 
 	// Tags to assign to the DB instance.
 	Tags []types.Tag
 
 	// The ARN from the key store with which to associate the instance for TDE
-	// encryption. This setting doesn't apply to RDS Custom.
+	// encryption. This setting doesn't apply to RDS Custom. Amazon Aurora Not
+	// applicable.
 	TdeCredentialArn *string
 
 	// The password for the given ARN from the key store in order to access the device.
diff --git a/service/rds/api_op_CreateDBInstanceReadReplica.go b/service/rds/api_op_CreateDBInstanceReadReplica.go
index 1769f4155ed..245674f03f4 100644
--- a/service/rds/api_op_CreateDBInstanceReadReplica.go
+++ b/service/rds/api_op_CreateDBInstanceReadReplica.go
@@ -18,9 +18,9 @@ import (
 // MariaDB, Oracle, PostgreSQL, or SQL Server. For more information, see Working
 // with Read Replicas
 // (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReadRepl.html) in
-// the Amazon RDS User Guide. Amazon Aurora doesn't support this action. Call the
-// CreateDBInstance action to create a DB instance for an Aurora DB cluster. All
-// read replica DB instances are created with backups disabled. All other DB
+// the Amazon RDS User Guide. Amazon Aurora doesn't support this operation. Call
+// the CreateDBInstance operation to create a DB instance for an Aurora DB cluster.
+// All read replica DB instances are created with backups disabled. All other DB
 // instance attributes (including DB security groups and DB parameter groups) are
 // inherited from the source DB instance, except as specified. Your source DB
 // instance must have backup retention enabled.
@@ -135,15 +135,16 @@ type CreateDBInstanceReadReplicaInput struct {
 	// DBParameterGroup of source DB instance for a same Region read replica, or the
 	// default DBParameterGroup for the specified DB engine for a cross-Region read
 	// replica. Specifying a parameter group for this operation is only supported for
-	// Oracle DB instances. It isn't supported for RDS Custom. Constraints:
+	// MySQL and Oracle DB instances. It isn't supported for RDS Custom.
+	// Constraints:
 	//
-	// * Must be
-	// 1 to 255 letters, numbers, or hyphens.
+	// * Must be 1 to 255 letters, numbers, or hyphens.
 	//
-	// * First character must be a letter
+	// * First
+	// character must be a letter
 	//
-	// *
-	// Can't end with a hyphen or contain two consecutive hyphens
+	// * Can't end with a hyphen or contain two consecutive
+	// hyphens
 	DBParameterGroupName *string
 
 	// Specifies a DB subnet group for the DB instance. The new DB instance is created
@@ -295,49 +296,76 @@ type CreateDBInstanceReadReplicaInput struct {
 	// This setting doesn't apply to RDS Custom.
 	PerformanceInsightsKMSKeyId *string
 
-	// The amount of time, in days, to retain Performance Insights data. Valid values
-	// are 7 or 731 (2 years). This setting doesn't apply to RDS Custom.
+	// The number of days to retain Performance Insights data. The default is 7 days.
+	// The following values are valid:
+	//
+	// * 7
+	//
+	// * month * 31, where month is a number of
+	// months from 1-23
+	//
+	// * 731
+	//
+	// For example, the following values are valid:
+	//
+	// * 93 (3
+	// months * 31)
+	//
+	// * 341 (11 months * 31)
+	//
+	// * 589 (19 months * 31)
+	//
+	// * 731
+	//
+	// If you
+	// specify a retention period such as 94, which isn't a valid value, RDS issues an
+	// error. This setting doesn't apply to RDS Custom.
 	PerformanceInsightsRetentionPeriod *int32
 
 	// The port number that the DB instance uses for connections. Default: Inherits
 	// from the source DB instance Valid Values: 1150-65535
 	Port *int32
 
-	// The URL that contains a Signature Version 4 signed request for the
-	// CreateDBInstanceReadReplica API action in the source Amazon Web Services Region
-	// that contains the source DB instance. You must specify this parameter when you
-	// create an encrypted read replica from another Amazon Web Services Region by
-	// using the Amazon RDS API. Don't specify PreSignedUrl when you are creating an
-	// encrypted read replica in the same Amazon Web Services Region. The presigned URL
-	// must be a valid request for the CreateDBInstanceReadReplica API action that can
-	// be executed in the source Amazon Web Services Region that contains the encrypted
-	// source DB instance. The presigned URL request must contain the following
-	// parameter values:
-	//
-	// * DestinationRegion - The Amazon Web Services Region that the
-	// encrypted read replica is created in. This Amazon Web Services Region is the
-	// same one where the CreateDBInstanceReadReplica action is called that contains
-	// this presigned URL. For example, if you create an encrypted DB instance in the
-	// us-west-1 Amazon Web Services Region, from a source DB instance in the us-east-2
-	// Amazon Web Services Region, then you call the CreateDBInstanceReadReplica action
-	// in the us-east-1 Amazon Web Services Region and provide a presigned URL that
-	// contains a call to the CreateDBInstanceReadReplica action in the us-west-2
-	// Amazon Web Services Region. For this example, the DestinationRegion in the
-	// presigned URL must be set to the us-east-1 Amazon Web Services Region.
+	// When you are creating a read replica from one Amazon Web Services GovCloud (US)
+	// Region to another or from one China Amazon Web Services Region to another, the
+	// URL that contains a Signature Version 4 signed request for the
+	// CreateDBInstanceReadReplica API operation in the source Amazon Web Services
+	// Region that contains the source DB instance. This setting applies only to Amazon
+	// Web Services GovCloud (US) Regions and China Amazon Web Services Regions. It's
+	// ignored in other Amazon Web Services Regions. You must specify this parameter
+	// when you create an encrypted read replica from another Amazon Web Services
+	// Region by using the Amazon RDS API. Don't specify PreSignedUrl when you are
+	// creating an encrypted read replica in the same Amazon Web Services Region. The
+	// presigned URL must be a valid request for the CreateDBInstanceReadReplica API
+	// operation that can run in the source Amazon Web Services Region that contains
+	// the encrypted source DB instance. The presigned URL request must contain the
+	// following parameter values:
+	//
+	// * DestinationRegion - The Amazon Web Services
+	// Region that the encrypted read replica is created in. This Amazon Web Services
+	// Region is the same one where the CreateDBInstanceReadReplica operation is called
+	// that contains this presigned URL. For example, if you create an encrypted DB
+	// instance in the us-west-1 Amazon Web Services Region, from a source DB instance
+	// in the us-east-2 Amazon Web Services Region, then you call the
+	// CreateDBInstanceReadReplica operation in the us-east-1 Amazon Web Services
+	// Region and provide a presigned URL that contains a call to the
+	// CreateDBInstanceReadReplica operation in the us-west-2 Amazon Web Services
+	// Region. For this example, the DestinationRegion in the presigned URL must be set
+	// to the us-east-1 Amazon Web Services Region.
+	//
+	// * KmsKeyId - The KMS key
+	// identifier for the key to use to encrypt the read replica in the destination
+	// Amazon Web Services Region. This is the same identifier for both the
+	// CreateDBInstanceReadReplica operation that is called in the destination Amazon
+	// Web Services Region, and the operation contained in the presigned URL.
 	//
 	// *
-	// KmsKeyId - The Amazon Web Services KMS key identifier for the key to use to
-	// encrypt the read replica in the destination Amazon Web Services Region. This is
-	// the same identifier for both the CreateDBInstanceReadReplica action that is
-	// called in the destination Amazon Web Services Region, and the action contained
-	// in the presigned URL.
-	//
-	// * SourceDBInstanceIdentifier - The DB instance identifier
-	// for the encrypted DB instance to be replicated. This identifier must be in the
-	// Amazon Resource Name (ARN) format for the source Amazon Web Services Region. For
-	// example, if you are creating an encrypted read replica from a DB instance in the
-	// us-west-2 Amazon Web Services Region, then your SourceDBInstanceIdentifier looks
-	// like the following example:
+	// SourceDBInstanceIdentifier - The DB instance identifier for the encrypted DB
+	// instance to be replicated. This identifier must be in the Amazon Resource Name
+	// (ARN) format for the source Amazon Web Services Region. For example, if you are
+	// creating an encrypted read replica from a DB instance in the us-west-2 Amazon
+	// Web Services Region, then your SourceDBInstanceIdentifier looks like the
+	// following example:
 	// arn:aws:rds:us-west-2:123456789012:instance:mysql-instance1-20161115.
 	//
 	// To learn
@@ -349,10 +377,10 @@ type CreateDBInstanceReadReplicaInput struct {
 	// are using an Amazon Web Services SDK tool or the CLI, you can specify
 	// SourceRegion (or --source-region for the CLI) instead of specifying PreSignedUrl
 	// manually. Specifying SourceRegion autogenerates a presigned URL that is a valid
-	// request for the operation that can be executed in the source Amazon Web Services
-	// Region. SourceRegion isn't supported for SQL Server, because SQL Server on
-	// Amazon RDS doesn't support cross-Region read replicas. This setting doesn't
-	// apply to RDS Custom.
+	// request for the operation that can run in the source Amazon Web Services Region.
+	// SourceRegion isn't supported for SQL Server, because Amazon RDS for SQL Server
+	// doesn't support cross-Region read replicas. This setting doesn't apply to RDS
+	// Custom.
 	PreSignedUrl *string
 
 	// The number of CPU cores and the number of threads per core for the DB instance
diff --git a/service/rds/api_op_CreateEventSubscription.go b/service/rds/api_op_CreateEventSubscription.go
index a5b9d001083..c9a3bc2953d 100644
--- a/service/rds/api_op_CreateEventSubscription.go
+++ b/service/rds/api_op_CreateEventSubscription.go
@@ -11,7 +11,7 @@ import (
 	smithyhttp "github.com/aws/smithy-go/transport/http"
 )
 
-// Creates an RDS event notification subscription. This action requires a topic
+// Creates an RDS event notification subscription. This operation requires a topic
 // Amazon Resource Name (ARN) created by either the RDS console, the SNS console,
 // or the SNS API. To obtain an ARN with SNS, you must create a topic in Amazon SNS
 // and subscribe to the topic. The ARN is displayed in the SNS console. You can
diff --git a/service/rds/api_op_CreateGlobalCluster.go b/service/rds/api_op_CreateGlobalCluster.go
index 69e9fa56f4d..68ef360f1ae 100644
--- a/service/rds/api_op_CreateGlobalCluster.go
+++ b/service/rds/api_op_CreateGlobalCluster.go
@@ -18,7 +18,7 @@ import (
 // subsystem. You can create a global database that is initially empty, and then
 // add a primary cluster and a secondary cluster to it. Or you can specify an
 // existing Aurora cluster during the create operation, and this cluster becomes
-// the primary cluster of the global database. This action only applies to Aurora
+// the primary cluster of the global database. This action applies only to Aurora
 // DB clusters.
 func (c *Client) CreateGlobalCluster(ctx context.Context, params *CreateGlobalClusterInput, optFns ...func(*Options)) (*CreateGlobalClusterOutput, error) {
 	if params == nil {
@@ -37,7 +37,7 @@ func (c *Client) CreateGlobalCluster(ctx context.Context, params *CreateGlobalCl
 
 type CreateGlobalClusterInput struct {
 
-	// The name for your database of up to 64 alpha-numeric characters. If you do not
+	// The name for your database of up to 64 alphanumeric characters. If you do not
 	// provide a name, Amazon Aurora will not create a database in the global database
 	// cluster you are creating.
 	DatabaseName *string
diff --git a/service/rds/api_op_DescribeEvents.go b/service/rds/api_op_DescribeEvents.go
index abf457c25a7..ccdae4e5eb2 100644
--- a/service/rds/api_op_DescribeEvents.go
+++ b/service/rds/api_op_DescribeEvents.go
@@ -17,8 +17,13 @@ import (
 // security groups, DB snapshots, DB cluster snapshots, and RDS Proxies for the
 // past 14 days. Events specific to a particular DB instance, DB cluster, DB
 // parameter group, DB security group, DB snapshot, DB cluster snapshot group, or
-// RDS Proxy can be obtained by providing the name as a parameter. By default, RDS
-// returns events that were generated in the past hour.
+// RDS Proxy can be obtained by providing the name as a parameter. For more
+// information on working with events, see Monitoring Amazon RDS events
+// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/working-with-events.html)
+// in the Amazon RDS User Guide and Monitoring Amazon Aurora events
+// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/working-with-events.html)
+// in the Amazon Aurora User Guide. By default, RDS returns events that were
+// generated in the past hour.
 func (c *Client) DescribeEvents(ctx context.Context, params *DescribeEventsInput, optFns ...func(*Options)) (*DescribeEventsOutput, error) {
 	if params == nil {
 		params = &DescribeEventsInput{}
diff --git a/service/rds/api_op_FailoverDBCluster.go b/service/rds/api_op_FailoverDBCluster.go
index f7cfe0e47e7..e894b2fc5ea 100644
--- a/service/rds/api_op_FailoverDBCluster.go
+++ b/service/rds/api_op_FailoverDBCluster.go
@@ -18,7 +18,7 @@ import (
 // instances (read-only instances) in the DB cluster to be the primary DB instance
 // (the cluster writer). An Amazon Aurora DB cluster automatically fails over to an
 // Aurora Replica, if one exists, when the primary DB instance fails. A Multi-AZ DB
-// cluster automatically fails over to a readbable standby DB instance when the
+// cluster automatically fails over to a readable standby DB instance when the
 // primary DB instance fails. To simulate a failure of a primary instance for
 // testing, you can force a failover. Because each instance in a DB cluster has its
 // own endpoint address, make sure to clean up and re-establish any existing
diff --git a/service/rds/api_op_ModifyDBCluster.go b/service/rds/api_op_ModifyDBCluster.go
index 20c794eea18..4ee78268470 100644
--- a/service/rds/api_op_ModifyDBCluster.go
+++ b/service/rds/api_op_ModifyDBCluster.go
@@ -274,8 +274,30 @@ type ModifyDBClusterInput struct {
 	// Valid for: Multi-AZ DB clusters only
 	PerformanceInsightsKMSKeyId *string
 
-	// The amount of time, in days, to retain Performance Insights data. Valid values
-	// are 7 or 731 (2 years). Valid for: Multi-AZ DB clusters only
+	// The number of days to retain Performance Insights data. The default is 7 days.
+	// The following values are valid:
+	//
+	// * 7
+	//
+	// * month * 31, where month is a number of
+	// months from 1-23
+	//
+	// * 731
+	//
+	// For example, the following values are valid:
+	//
+	// * 93 (3
+	// months * 31)
+	//
+	// * 341 (11 months * 31)
+	//
+	// * 589 (19 months * 31)
+	//
+	// * 731
+	//
+	// If you
+	// specify a retention period such as 94, which isn't a valid value, RDS issues an
+	// error. Valid for: Multi-AZ DB clusters only
 	PerformanceInsightsRetentionPeriod *int32
 
 	// The port number on which the DB cluster accepts connections. Constraints: Value
diff --git a/service/rds/api_op_ModifyDBClusterParameterGroup.go b/service/rds/api_op_ModifyDBClusterParameterGroup.go
index d8b56f9c096..6b81d6db2d0 100644
--- a/service/rds/api_op_ModifyDBClusterParameterGroup.go
+++ b/service/rds/api_op_ModifyDBClusterParameterGroup.go
@@ -22,14 +22,14 @@ import (
 // when creating the default database for a DB cluster, such as the character set
 // for the default database defined by the character_set_database parameter. You
 // can use the Parameter Groups option of the Amazon RDS console
-// (https://console.aws.amazon.com/rds/) or the DescribeDBClusterParameters action
-// to verify that your DB cluster parameter group has been created or modified. If
-// the modified DB cluster parameter group is used by an Aurora Serverless v1
-// cluster, Aurora applies the update immediately. The cluster restart might
-// interrupt your workload. In that case, your application must reopen any
-// connections and retry any transactions that were active when the parameter
-// changes took effect. For more information on Amazon Aurora DB clusters, see
-// What is Amazon Aurora?
+// (https://console.aws.amazon.com/rds/) or the DescribeDBClusterParameters
+// operation to verify that your DB cluster parameter group has been created or
+// modified. If the modified DB cluster parameter group is used by an Aurora
+// Serverless v1 cluster, Aurora applies the update immediately. The cluster
+// restart might interrupt your workload. In that case, your application must
+// reopen any connections and retry any transactions that were active when the
+// parameter changes took effect. For more information on Amazon Aurora DB
+// clusters, see  What is Amazon Aurora?
 // (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/CHAP_AuroraOverview.html)
 // in the Amazon Aurora User Guide. For more information on Multi-AZ DB clusters,
 // see  Multi-AZ deployments with two readable standby DB instances
diff --git a/service/rds/api_op_ModifyDBClusterSnapshotAttribute.go b/service/rds/api_op_ModifyDBClusterSnapshotAttribute.go
index 2568033c870..a84a672b8c1 100644
--- a/service/rds/api_op_ModifyDBClusterSnapshotAttribute.go
+++ b/service/rds/api_op_ModifyDBClusterSnapshotAttribute.go
@@ -25,7 +25,7 @@ import (
 // as a value for that parameter in this case. To view which Amazon Web Services
 // accounts have access to copy or restore a manual DB cluster snapshot, or whether
 // a manual DB cluster snapshot is public or private, use the
-// DescribeDBClusterSnapshotAttributes API action. The accounts are returned as
+// DescribeDBClusterSnapshotAttributes API operation. The accounts are returned as
 // values for the restore attribute.
 func (c *Client) ModifyDBClusterSnapshotAttribute(ctx context.Context, params *ModifyDBClusterSnapshotAttributeInput, optFns ...func(*Options)) (*ModifyDBClusterSnapshotAttributeOutput, error) {
 	if params == nil {
@@ -48,7 +48,7 @@ type ModifyDBClusterSnapshotAttributeInput struct {
 	// The name of the DB cluster snapshot attribute to modify. To manage authorization
 	// for other Amazon Web Services accounts to copy or restore a manual DB cluster
 	// snapshot, set this value to restore. To view the list of attributes available to
-	// modify, use the DescribeDBClusterSnapshotAttributes API action.
+	// modify, use the DescribeDBClusterSnapshotAttributes API operation.
 	//
 	// This member is required.
 	AttributeName *string
diff --git a/service/rds/api_op_ModifyDBInstance.go b/service/rds/api_op_ModifyDBInstance.go
index 4ff5d28d5e7..cb44f3f0d11 100644
--- a/service/rds/api_op_ModifyDBInstance.go
+++ b/service/rds/api_op_ModifyDBInstance.go
@@ -111,14 +111,14 @@ type ModifyDBInstanceInput struct {
 	// setting Constraints:
 	//
 	// * It must be a value from 0 to 35. It can't be set to 0 if
-	// the DB instance is a source to read replicas. It can't be set to 0 or 35 for an
-	// RDS Custom for Oracle DB instance.
+	// the DB instance is a source to read replicas. It can't be set to 0 for an RDS
+	// Custom for Oracle DB instance.
 	//
-	// * It can be specified for a MySQL read
-	// replica only if the source is running MySQL 5.6 or later.
+	// * It can be specified for a MySQL read replica
+	// only if the source is running MySQL 5.6 or later.
 	//
-	// * It can be specified
-	// for a PostgreSQL read replica only if the source is running PostgreSQL 9.3.5.
+	// * It can be specified for a
+	// PostgreSQL read replica only if the source is running PostgreSQL 9.3.5.
 	BackupRetentionPeriod *int32
 
 	// Specifies the certificate to associate with the DB instance. This setting
@@ -161,12 +161,14 @@ type ModifyDBInstanceInput struct {
 	// more information, see ModifyDBCluster.
 	CopyTagsToSnapshot *bool
 
-	// The new compute and memory capacity of the DB instance, for example db.m4.large.
+	// The new compute and memory capacity of the DB instance, for example db.m5.large.
 	// Not all DB instance classes are available in all Amazon Web Services Regions, or
 	// for all database engines. For the full list of DB instance classes, and
-	// availability for your engine, see DB Instance Class
+	// availability for your engine, see DB instance classes
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.DBInstanceClass.html)
-	// in the Amazon RDS User Guide. If you modify the DB instance class, an outage
+	// in the Amazon RDS User Guide or Aurora DB instance classes
+	// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Concepts.DBInstanceClass.html)
+	// in the Amazon Aurora User Guide. If you modify the DB instance class, an outage
 	// occurs during the change. The change is applied during the next maintenance
 	// window, unless ApplyImmediately is enabled for this request. This setting
 	// doesn't apply to RDS Custom for Oracle. Default: Uses existing setting
@@ -263,7 +265,7 @@ type ModifyDBInstanceInput struct {
 	// A value that indicates whether to enable Performance Insights for the DB
 	// instance. For more information, see Using Amazon Performance Insights
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PerfInsights.html)
-	// in the Amazon RDS User Guide.. This setting doesn't apply to RDS Custom.
+	// in the Amazon RDS User Guide. This setting doesn't apply to RDS Custom.
 	EnablePerformanceInsights *bool
 
 	// The version number of the database engine to upgrade to. Changing this parameter
@@ -320,8 +322,8 @@ type ModifyDBInstanceInput struct {
 	// Constraints: Must contain from 8 to 128 characters. MySQL Constraints: Must
 	// contain from 8 to 41 characters. Oracle Constraints: Must contain from 8 to 30
 	// characters. PostgreSQL Constraints: Must contain from 8 to 128 characters.
-	// Amazon RDS API actions never return the password, so this action provides a way
-	// to regain access to a primary instance user if the password is lost. This
+	// Amazon RDS API operations never return the password, so this action provides a
+	// way to regain access to a primary instance user if the password is lost. This
 	// includes restoring privileges that might have been accidentally revoked.
 	MasterUserPassword *string
 
@@ -408,8 +410,30 @@ type ModifyDBInstanceInput struct {
 	// This setting doesn't apply to RDS Custom.
 	PerformanceInsightsKMSKeyId *string
 
-	// The amount of time, in days, to retain Performance Insights data. Valid values
-	// are 7 or 731 (2 years). This setting doesn't apply to RDS Custom.
+	// The number of days to retain Performance Insights data. The default is 7 days.
+	// The following values are valid:
+	//
+	// * 7
+	//
+	// * month * 31, where month is a number of
+	// months from 1-23
+	//
+	// * 731
+	//
+	// For example, the following values are valid:
+	//
+	// * 93 (3
+	// months * 31)
+	//
+	// * 341 (11 months * 31)
+	//
+	// * 589 (19 months * 31)
+	//
+	// * 731
+	//
+	// If you
+	// specify a retention period such as 94, which isn't a valid value, RDS issues an
+	// error. This setting doesn't apply to RDS Custom.
 	PerformanceInsightsRetentionPeriod *int32
 
 	// The daily time range during which automated backups are created if automated
diff --git a/service/rds/api_op_ModifyDBProxyTargetGroup.go b/service/rds/api_op_ModifyDBProxyTargetGroup.go
index 9b7924a61a4..91e5ce6655d 100644
--- a/service/rds/api_op_ModifyDBProxyTargetGroup.go
+++ b/service/rds/api_op_ModifyDBProxyTargetGroup.go
@@ -29,12 +29,12 @@ func (c *Client) ModifyDBProxyTargetGroup(ctx context.Context, params *ModifyDBP
 
 type ModifyDBProxyTargetGroupInput struct {
 
-	// The name of the new proxy to which to assign the target group.
+	// The name of the proxy.
 	//
 	// This member is required.
 	DBProxyName *string
 
-	// The name of the new target group to assign to the proxy.
+	// The name of the target group to modify.
 	//
 	// This member is required.
 	TargetGroupName *string
diff --git a/service/rds/api_op_ModifyDBSnapshotAttribute.go b/service/rds/api_op_ModifyDBSnapshotAttribute.go
index 43b7b0bb135..1c9b4e5e5c5 100644
--- a/service/rds/api_op_ModifyDBSnapshotAttribute.go
+++ b/service/rds/api_op_ModifyDBSnapshotAttribute.go
@@ -24,8 +24,8 @@ import (
 // ValuesToAdd parameter. You can't use all as a value for that parameter in this
 // case. To view which Amazon Web Services accounts have access to copy or restore
 // a manual DB snapshot, or whether a manual DB snapshot public or private, use the
-// DescribeDBSnapshotAttributes API action. The accounts are returned as values for
-// the restore attribute.
+// DescribeDBSnapshotAttributes API operation. The accounts are returned as values
+// for the restore attribute.
 func (c *Client) ModifyDBSnapshotAttribute(ctx context.Context, params *ModifyDBSnapshotAttributeInput, optFns ...func(*Options)) (*ModifyDBSnapshotAttributeOutput, error) {
 	if params == nil {
 		params = &ModifyDBSnapshotAttributeInput{}
@@ -47,7 +47,7 @@ type ModifyDBSnapshotAttributeInput struct {
 	// The name of the DB snapshot attribute to modify. To manage authorization for
 	// other Amazon Web Services accounts to copy or restore a manual DB snapshot, set
 	// this value to restore. To view the list of attributes available to modify, use
-	// the DescribeDBSnapshotAttributes API action.
+	// the DescribeDBSnapshotAttributes API operation.
 	//
 	// This member is required.
 	AttributeName *string
diff --git a/service/rds/api_op_RestoreDBClusterFromS3.go b/service/rds/api_op_RestoreDBClusterFromS3.go
index aa140078a18..c3180036508 100644
--- a/service/rds/api_op_RestoreDBClusterFromS3.go
+++ b/service/rds/api_op_RestoreDBClusterFromS3.go
@@ -61,8 +61,8 @@ type RestoreDBClusterFromS3Input struct {
 	DBClusterIdentifier *string
 
 	// The name of the database engine to be used for this DB cluster. Valid Values:
-	// aurora (for MySQL 5.6-compatible Aurora), aurora-mysql (for MySQL 5.7-compatible
-	// and MySQL 8.0-compatible Aurora), and aurora-postgresql
+	// aurora (for MySQL 5.6-compatible Aurora) and aurora-mysql (for MySQL
+	// 5.7-compatible and MySQL 8.0-compatible Aurora)
 	//
 	// This member is required.
 	Engine *string
@@ -193,12 +193,8 @@ type RestoreDBClusterFromS3Input struct {
 	// "DBEngineVersions[].EngineVersion" To list all of the available engine versions
 	// for aurora-mysql (for MySQL 5.7-compatible and MySQL 8.0-compatible Aurora), use
 	// the following command: aws rds describe-db-engine-versions --engine aurora-mysql
-	// --query "DBEngineVersions[].EngineVersion" To list all of the available engine
-	// versions for aurora-postgresql, use the following command: aws rds
-	// describe-db-engine-versions --engine aurora-postgresql --query
-	// "DBEngineVersions[].EngineVersion" Aurora MySQL Example: 5.6.10a,
-	// 5.6.mysql_aurora.1.19.2, 5.7.12, 5.7.mysql_aurora.2.04.5,
-	// 8.0.mysql_aurora.3.01.0 Aurora PostgreSQL Example: 9.6.3, 10.7
+	// --query "DBEngineVersions[].EngineVersion" Aurora MySQL Example: 5.6.10a,
+	// 5.6.mysql_aurora.1.19.2, 5.7.mysql_aurora.2.07.1, 8.0.mysql_aurora.3.02.0
 	EngineVersion *string
 
 	// The Amazon Web Services KMS key identifier for an encrypted DB cluster. The
diff --git a/service/rds/api_op_RestoreDBClusterFromSnapshot.go b/service/rds/api_op_RestoreDBClusterFromSnapshot.go
index 2e5596c0521..a86c7734639 100644
--- a/service/rds/api_op_RestoreDBClusterFromSnapshot.go
+++ b/service/rds/api_op_RestoreDBClusterFromSnapshot.go
@@ -162,7 +162,7 @@ type RestoreDBClusterFromSnapshotInput struct {
 	// For more information about exporting CloudWatch Logs for Amazon RDS, see
 	// Publishing Database Logs to Amazon CloudWatch Logs
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_LogAccess.html#USER_LogAccess.Procedural.UploadtoCloudWatch)
-	// in the Amazon RDS User Guide.. For more information about exporting CloudWatch
+	// in the Amazon RDS User Guide. For more information about exporting CloudWatch
 	// Logs for Amazon Aurora, see Publishing Database Logs to Amazon CloudWatch Logs
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/USER_LogAccess.html#USER_LogAccess.Procedural.UploadtoCloudWatch)
 	// in the Amazon Aurora User Guide. Valid for: Aurora DB clusters and Multi-AZ DB
diff --git a/service/rds/api_op_RestoreDBClusterToPointInTime.go b/service/rds/api_op_RestoreDBClusterToPointInTime.go
index 3d033478e9f..cafa62beaa3 100644
--- a/service/rds/api_op_RestoreDBClusterToPointInTime.go
+++ b/service/rds/api_op_RestoreDBClusterToPointInTime.go
@@ -146,7 +146,7 @@ type RestoreDBClusterToPointInTimeInput struct {
 	// For more information about exporting CloudWatch Logs for Amazon RDS, see
 	// Publishing Database Logs to Amazon CloudWatch Logs
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_LogAccess.html#USER_LogAccess.Procedural.UploadtoCloudWatch)
-	// in the Amazon RDS User Guide.. For more information about exporting CloudWatch
+	// in the Amazon RDS User Guide. For more information about exporting CloudWatch
 	// Logs for Amazon Aurora, see Publishing Database Logs to Amazon CloudWatch Logs
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/USER_LogAccess.html#USER_LogAccess.Procedural.UploadtoCloudWatch)
 	// in the Amazon Aurora User Guide. Valid for: Aurora DB clusters and Multi-AZ DB
diff --git a/service/rds/api_op_RestoreDBInstanceFromS3.go b/service/rds/api_op_RestoreDBInstanceFromS3.go
index 3c5b9d26f61..7dd75ce9c84 100644
--- a/service/rds/api_op_RestoreDBInstanceFromS3.go
+++ b/service/rds/api_op_RestoreDBInstanceFromS3.go
@@ -163,7 +163,7 @@ type RestoreDBInstanceFromS3Input struct {
 	// A value that indicates whether to enable Performance Insights for the DB
 	// instance. For more information, see Using Amazon Performance Insights
 	// (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PerfInsights.html)
-	// in the Amazon RDS User Guide..
+	// in the Amazon RDS User Guide.
 	EnablePerformanceInsights *bool
 
 	// The version number of the database engine to use. Choose the latest minor
@@ -262,8 +262,30 @@ type RestoreDBInstanceFromS3Input struct {
 	// account has a different default KMS key for each Amazon Web Services Region.
 	PerformanceInsightsKMSKeyId *string
 
-	// The amount of time, in days, to retain Performance Insights data. Valid values
-	// are 7 or 731 (2 years).
+	// The number of days to retain Performance Insights data. The default is 7 days.
+	// The following values are valid:
+	//
+	// * 7
+	//
+	// * month * 31, where month is a number of
+	// months from 1-23
+	//
+	// * 731
+	//
+	// For example, the following values are valid:
+	//
+	// * 93 (3
+	// months * 31)
+	//
+	// * 341 (11 months * 31)
+	//
+	// * 589 (19 months * 31)
+	//
+	// * 731
+	//
+	// If you
+	// specify a retention period such as 94, which isn't a valid value, RDS issues an
+	// error.
 	PerformanceInsightsRetentionPeriod *int32
 
 	// The port number on which the database accepts connections. Type: Integer Valid
diff --git a/service/rds/api_op_StartDBInstanceAutomatedBackupsReplication.go b/service/rds/api_op_StartDBInstanceAutomatedBackupsReplication.go
index ae7b4c34f3d..26cdf698b40 100644
--- a/service/rds/api_op_StartDBInstanceAutomatedBackupsReplication.go
+++ b/service/rds/api_op_StartDBInstanceAutomatedBackupsReplication.go
@@ -49,12 +49,23 @@ type StartDBInstanceAutomatedBackupsReplicationInput struct {
 	// arn:aws:kms:us-east-1:123456789012:key/AKIAIOSFODNN7EXAMPLE.
 	KmsKeyId *string
 
-	// A URL that contains a Signature Version 4 signed request for the
-	// StartDBInstanceAutomatedBackupsReplication action to be called in the Amazon Web
-	// Services Region of the source DB instance. The presigned URL must be a valid
-	// request for the StartDBInstanceAutomatedBackupsReplication API action that can
-	// be executed in the Amazon Web Services Region that contains the source DB
-	// instance.
+	// In an Amazon Web Services GovCloud (US) Region, an URL that contains a Signature
+	// Version 4 signed request for the StartDBInstanceAutomatedBackupsReplication
+	// operation to call in the Amazon Web Services Region of the source DB instance.
+	// The presigned URL must be a valid request for the
+	// StartDBInstanceAutomatedBackupsReplication API operation that can run in the
+	// Amazon Web Services Region that contains the source DB instance. This setting
+	// applies only to Amazon Web Services GovCloud (US) Regions. It's ignored in other
+	// Amazon Web Services Regions. To learn how to generate a Signature Version 4
+	// signed request, see  Authenticating Requests: Using Query Parameters (Amazon Web
+	// Services Signature Version 4)
+	// (https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html)
+	// and  Signature Version 4 Signing Process
+	// (https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html). If you
+	// are using an Amazon Web Services SDK tool or the CLI, you can specify
+	// SourceRegion (or --source-region for the CLI) instead of specifying PreSignedUrl
+	// manually. Specifying SourceRegion autogenerates a presigned URL that is a valid
+	// request for the operation that can run in the source Amazon Web Services Region.
 	PreSignedUrl *string
 
 	noSmithyDocumentSerde
diff --git a/service/rds/api_op_StopDBInstanceAutomatedBackupsReplication.go b/service/rds/api_op_StopDBInstanceAutomatedBackupsReplication.go
index 21a9fc27718..d6ae4480304 100644
--- a/service/rds/api_op_StopDBInstanceAutomatedBackupsReplication.go
+++ b/service/rds/api_op_StopDBInstanceAutomatedBackupsReplication.go
@@ -12,8 +12,8 @@ import (
 )
 
 // Stops automated backup replication for a DB instance. This command doesn't apply
-// to RDS Custom. For more information, see  Replicating Automated Backups to
-// Another Amazon Web Services Region
+// to RDS Custom, Aurora MySQL, and Aurora PostgreSQL. For more information, see
+// Replicating Automated Backups to Another Amazon Web Services Region
 // (https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReplicateBackups.html)
 // in the Amazon RDS User Guide.
 func (c *Client) StopDBInstanceAutomatedBackupsReplication(ctx context.Context, params *StopDBInstanceAutomatedBackupsReplicationInput, optFns ...func(*Options)) (*StopDBInstanceAutomatedBackupsReplicationOutput, error) {
diff --git a/service/rds/types/types.go b/service/rds/types/types.go
index 4514f5dda29..f73374be3c7 100644
--- a/service/rds/types/types.go
+++ b/service/rds/types/types.go
@@ -554,9 +554,29 @@ type DBCluster struct {
 	// non-Aurora Multi-AZ DB clusters.
 	PerformanceInsightsKMSKeyId *string
 
-	// The amount of time, in days, to retain Performance Insights data. Valid values
-	// are 7 or 731 (2 years). This setting is only for non-Aurora Multi-AZ DB
-	// clusters.
+	// The number of days to retain Performance Insights data. The default is 7 days.
+	// The following values are valid:
+	//
+	// * 7
+	//
+	// * month * 31, where month is a number of
+	// months from 1-23
+	//
+	// * 731
+	//
+	// For example, the following values are valid:
+	//
+	// * 93 (3
+	// months * 31)
+	//
+	// * 341 (11 months * 31)
+	//
+	// * 589 (19 months * 31)
+	//
+	// * 731
+	//
+	// This
+	// setting is only for non-Aurora Multi-AZ DB clusters.
 	PerformanceInsightsRetentionPeriod *int32
 
 	// Specifies the port that the database engine is listening on.
@@ -1337,8 +1357,26 @@ type DBInstance struct {
 	// ID, alias ARN, or alias name for the KMS key.
 	PerformanceInsightsKMSKeyId *string
 
-	// The amount of time, in days, to retain Performance Insights data. Valid values
-	// are 7 or 731 (2 years).
+	// The number of days to retain Performance Insights data. The default is 7 days.
+	// The following values are valid:
+	//
+	// * 7
+	//
+	// * month * 31, where month is a number of
+	// months from 1-23
+	//
+	// * 731
+	//
+	// For example, the following values are valid:
+	//
+	// * 93 (3
+	// months * 31)
+	//
+	// * 341 (11 months * 31)
+	//
+	// * 589 (19 months * 31)
+	//
+	// * 731
 	PerformanceInsightsRetentionPeriod *int32
 
 	// Specifies the daily time range during which automated backups are created if
@@ -2225,7 +2263,9 @@ type EngineDefaults struct {
 	noSmithyDocumentSerde
 }
 
-// This data type is used as a response element in the DescribeEvents action.
+// This data type is used as a response element in the DescribeEvents
+// (https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_DescribeEvents.html)
+// action.
 type Event struct {
 
 	// Specifies the date and time of the event.
@@ -2250,6 +2290,7 @@ type Event struct {
 }
 
 // Contains the results of a successful invocation of the DescribeEventCategories
+// (https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_DescribeEventCategories.html)
 // operation.
 type EventCategoriesMap struct {
 
@@ -3656,7 +3697,8 @@ type ValidStorageOptions struct {
 // membership.
 type VpcSecurityGroupMembership struct {
 
-	// The status of the VPC security group.
+	// The membership status of the VPC security group. Currently, the only valid
+	// status is active.
 	Status *string
 
 	// The name of the VPC security group.