diff --git a/packages/google-cloud-language/protos/google/cloud/language/v1/language_service.proto b/packages/google-cloud-language/protos/google/cloud/language/v1/language_service.proto
index 7a15c8bf14c..41d92f344c7 100644
--- a/packages/google-cloud-language/protos/google/cloud/language/v1/language_service.proto
+++ b/packages/google-cloud-language/protos/google/cloud/language/v1/language_service.proto
@@ -18,45 +18,53 @@ syntax = "proto3";
 package google.cloud.language.v1;
 
 import "google/api/annotations.proto";
+import "google/api/client.proto";
+import "google/api/field_behavior.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/language/v1;language";
 option java_multiple_files = true;
 option java_outer_classname = "LanguageServiceProto";
 option java_package = "com.google.cloud.language.v1";
 
+
 // Provides text analysis operations such as sentiment analysis and entity
 // recognition.
 service LanguageService {
+  option (google.api.default_host) = "language.googleapis.com";
+  option (google.api.oauth_scopes) =
+    "https://www.googleapis.com/auth/cloud-language,"
+    "https://www.googleapis.com/auth/cloud-platform";
   // Analyzes the sentiment of the provided text.
-  rpc AnalyzeSentiment(AnalyzeSentimentRequest)
-      returns (AnalyzeSentimentResponse) {
+  rpc AnalyzeSentiment(AnalyzeSentimentRequest) returns (AnalyzeSentimentResponse) {
     option (google.api.http) = {
       post: "/v1/documents:analyzeSentiment"
       body: "*"
     };
+    option (google.api.method_signature) = "document,encoding_type";
+    option (google.api.method_signature) = "document";
   }
 
   // Finds named entities (currently proper names and common nouns) in the text
   // along with entity types, salience, mentions for each entity, and
   // other properties.
-  rpc AnalyzeEntities(AnalyzeEntitiesRequest)
-      returns (AnalyzeEntitiesResponse) {
+  rpc AnalyzeEntities(AnalyzeEntitiesRequest) returns (AnalyzeEntitiesResponse) {
     option (google.api.http) = {
       post: "/v1/documents:analyzeEntities"
       body: "*"
     };
+    option (google.api.method_signature) = "document,encoding_type";
+    option (google.api.method_signature) = "document";
   }
 
-  // Finds entities, similar to
-  // [AnalyzeEntities][google.cloud.language.v1.LanguageService.AnalyzeEntities]
-  // in the text and analyzes sentiment associated with each entity and its
-  // mentions.
-  rpc AnalyzeEntitySentiment(AnalyzeEntitySentimentRequest)
-      returns (AnalyzeEntitySentimentResponse) {
+  // Finds entities, similar to [AnalyzeEntities][google.cloud.language.v1.LanguageService.AnalyzeEntities] in the text and analyzes
+  // sentiment associated with each entity and its mentions.
+  rpc AnalyzeEntitySentiment(AnalyzeEntitySentimentRequest) returns (AnalyzeEntitySentimentResponse) {
     option (google.api.http) = {
       post: "/v1/documents:analyzeEntitySentiment"
       body: "*"
     };
+    option (google.api.method_signature) = "document,encoding_type";
+    option (google.api.method_signature) = "document";
   }
 
   // Analyzes the syntax of the text and provides sentence boundaries and
@@ -67,6 +75,8 @@ service LanguageService {
       post: "/v1/documents:analyzeSyntax"
       body: "*"
     };
+    option (google.api.method_signature) = "document,encoding_type";
+    option (google.api.method_signature) = "document";
   }
 
   // Classifies a document into categories.
@@ -75,6 +85,7 @@ service LanguageService {
       post: "/v1/documents:classifyText"
       body: "*"
     };
+    option (google.api.method_signature) = "document";
   }
 
   // A convenience method that provides all the features that analyzeSentiment,
@@ -84,6 +95,8 @@ service LanguageService {
       post: "/v1/documents:annotateText"
       body: "*"
     };
+    option (google.api.method_signature) = "document,features,encoding_type";
+    option (google.api.method_signature) = "document,features";
   }
 }
 
@@ -111,6 +124,7 @@ message Document {
   // Google Cloud Storage URI.
   oneof source {
     // The content of the input in string format.
+    // Cloud audit logging exempt since it is based on user data.
     string content = 2;
 
     // The Google Cloud Storage URI where the file content is located.
@@ -137,8 +151,8 @@ message Sentence {
   TextSpan text = 1;
 
   // For calls to [AnalyzeSentiment][] or if
-  // [AnnotateTextRequest.Features.extract_document_sentiment][google.cloud.language.v1.AnnotateTextRequest.Features.extract_document_sentiment]
-  // is set to true, this field will contain the sentiment for the sentence.
+  // [AnnotateTextRequest.Features.extract_document_sentiment][google.cloud.language.v1.AnnotateTextRequest.Features.extract_document_sentiment] is set to
+  // true, this field will contain the sentiment for the sentence.
   Sentiment sentiment = 2;
 }
 
@@ -146,7 +160,10 @@ message Sentence {
 // a person, an organization, or location. The API associates information, such
 // as salience and mentions, with entities.
 message Entity {
-  // The type of the entity.
+  // The type of the entity. For most entity types, the associated metadata is a
+  // Wikipedia URL (`wikipedia_url`) and Knowledge Graph MID (`mid`). The table
+  // below lists the associated fields for entities that have different
+  // metadata.
   enum Type {
     // Unknown
     UNKNOWN = 0;
@@ -163,28 +180,53 @@ message Entity {
     // Event
     EVENT = 4;
 
-    // Work of art
+    // Artwork
     WORK_OF_ART = 5;
 
-    // Consumer goods
+    // Consumer product
     CONSUMER_GOOD = 6;
 
-    // Other types
+    // Other types of entities
     OTHER = 7;
 
-    // Phone number
+    // Phone number<br><br>
+    // The metadata lists the phone number, formatted according to local
+    // convention, plus whichever additional elements appear in the text:<ul>
+    // <li><code>number</code> &ndash; the actual number, broken down into
+    // sections as per local convention</li> <li><code>national_prefix</code>
+    // &ndash; country code, if detected</li> <li><code>area_code</code> &ndash;
+    // region or area code, if detected</li> <li><code>extension</code> &ndash;
+    // phone extension (to be dialed after connection), if detected</li></ul>
     PHONE_NUMBER = 9;
 
-    // Address
+    // Address<br><br>
+    // The metadata identifies the street number and locality plus whichever
+    // additional elements appear in the text:<ul>
+    // <li><code>street_number</code> &ndash; street number</li>
+    // <li><code>locality</code> &ndash; city or town</li>
+    // <li><code>street_name</code> &ndash; street/route name, if detected</li>
+    // <li><code>postal_code</code> &ndash; postal code, if detected</li>
+    // <li><code>country</code> &ndash; country, if detected</li>
+    // <li><code>broad_region</code> &ndash; administrative area, such as the
+    // state, if detected</li> <li><code>narrow_region</code> &ndash; smaller
+    // administrative area, such as county, if detected</li>
+    // <li><code>sublocality</code> &ndash; used in Asian addresses to demark a
+    // district within a city, if detected</li></ul>
     ADDRESS = 10;
 
-    // Date
+    // Date<br><br>
+    // The metadata identifies the components of the date:<ul>
+    // <li><code>year</code> &ndash; four digit year, if detected</li>
+    // <li><code>month</code> &ndash; two digit month number, if detected</li>
+    // <li><code>day</code> &ndash; two digit day number, if detected</li></ul>
     DATE = 11;
 
-    // Number
+    // Number<br><br>
+    // The metadata is the number itself.
     NUMBER = 12;
 
-    // Price
+    // Price<br><br>
+    // The metadata identifies the <code>value</code> and <code>currency</code>.
     PRICE = 13;
   }
 
@@ -196,8 +238,9 @@ message Entity {
 
   // Metadata associated with the entity.
   //
-  // Currently, Wikipedia URLs and Knowledge Graph MIDs are provided, if
-  // available. The associated keys are "wikipedia_url" and "mid", respectively.
+  // For most entity types, the metadata is a Wikipedia URL (`wikipedia_url`)
+  // and Knowledge Graph MID (`mid`), if they are available. For the metadata
+  // associated with other entity types, see the Type table below.
   map<string, string> metadata = 3;
 
   // The salience score associated with the entity in the [0, 1.0] range.
@@ -213,9 +256,9 @@ message Entity {
   repeated EntityMention mentions = 5;
 
   // For calls to [AnalyzeEntitySentiment][] or if
-  // [AnnotateTextRequest.Features.extract_entity_sentiment][google.cloud.language.v1.AnnotateTextRequest.Features.extract_entity_sentiment]
-  // is set to true, this field will contain the aggregate sentiment expressed
-  // for this entity in the provided document.
+  // [AnnotateTextRequest.Features.extract_entity_sentiment][google.cloud.language.v1.AnnotateTextRequest.Features.extract_entity_sentiment] is set to
+  // true, this field will contain the aggregate sentiment expressed for this
+  // entity in the provided document.
   Sentiment sentiment = 6;
 }
 
@@ -892,9 +935,9 @@ message EntityMention {
   Type type = 2;
 
   // For calls to [AnalyzeEntitySentiment][] or if
-  // [AnnotateTextRequest.Features.extract_entity_sentiment][google.cloud.language.v1.AnnotateTextRequest.Features.extract_entity_sentiment]
-  // is set to true, this field will contain the sentiment expressed for this
-  // mention of the entity in the provided document.
+  // [AnnotateTextRequest.Features.extract_entity_sentiment][google.cloud.language.v1.AnnotateTextRequest.Features.extract_entity_sentiment] is set to
+  // true, this field will contain the sentiment expressed for this mention of
+  // the entity in the provided document.
   Sentiment sentiment = 3;
 }
 
@@ -904,9 +947,7 @@ message TextSpan {
   string content = 1;
 
   // The API calculates the beginning offset of the content in the original
-  // document according to the
-  // [EncodingType][google.cloud.language.v1.EncodingType] specified in the API
-  // request.
+  // document according to the [EncodingType][google.cloud.language.v1.EncodingType] specified in the API request.
   int32 begin_offset = 2;
 }
 
@@ -924,7 +965,7 @@ message ClassificationCategory {
 // The sentiment analysis request message.
 message AnalyzeSentimentRequest {
   // Input document.
-  Document document = 1;
+  Document document = 1 [(google.api.field_behavior) = REQUIRED];
 
   // The encoding type used by the API to calculate sentence offsets.
   EncodingType encoding_type = 2;
@@ -937,8 +978,7 @@ message AnalyzeSentimentResponse {
 
   // The language of the text, which will be the same as the language specified
   // in the request or, if not specified, the automatically-detected language.
-  // See [Document.language][google.cloud.language.v1.Document.language] field
-  // for more details.
+  // See [Document.language][google.cloud.language.v1.Document.language] field for more details.
   string language = 2;
 
   // The sentiment for all the sentences in the document.
@@ -948,7 +988,7 @@ message AnalyzeSentimentResponse {
 // The entity-level sentiment analysis request message.
 message AnalyzeEntitySentimentRequest {
   // Input document.
-  Document document = 1;
+  Document document = 1 [(google.api.field_behavior) = REQUIRED];
 
   // The encoding type used by the API to calculate offsets.
   EncodingType encoding_type = 2;
@@ -961,15 +1001,14 @@ message AnalyzeEntitySentimentResponse {
 
   // The language of the text, which will be the same as the language specified
   // in the request or, if not specified, the automatically-detected language.
-  // See [Document.language][google.cloud.language.v1.Document.language] field
-  // for more details.
+  // See [Document.language][google.cloud.language.v1.Document.language] field for more details.
   string language = 2;
 }
 
 // The entity analysis request message.
 message AnalyzeEntitiesRequest {
   // Input document.
-  Document document = 1;
+  Document document = 1 [(google.api.field_behavior) = REQUIRED];
 
   // The encoding type used by the API to calculate offsets.
   EncodingType encoding_type = 2;
@@ -982,15 +1021,14 @@ message AnalyzeEntitiesResponse {
 
   // The language of the text, which will be the same as the language specified
   // in the request or, if not specified, the automatically-detected language.
-  // See [Document.language][google.cloud.language.v1.Document.language] field
-  // for more details.
+  // See [Document.language][google.cloud.language.v1.Document.language] field for more details.
   string language = 2;
 }
 
 // The syntax analysis request message.
 message AnalyzeSyntaxRequest {
   // Input document.
-  Document document = 1;
+  Document document = 1 [(google.api.field_behavior) = REQUIRED];
 
   // The encoding type used by the API to calculate offsets.
   EncodingType encoding_type = 2;
@@ -1006,15 +1044,14 @@ message AnalyzeSyntaxResponse {
 
   // The language of the text, which will be the same as the language specified
   // in the request or, if not specified, the automatically-detected language.
-  // See [Document.language][google.cloud.language.v1.Document.language] field
-  // for more details.
+  // See [Document.language][google.cloud.language.v1.Document.language] field for more details.
   string language = 3;
 }
 
 // The document classification request message.
 message ClassifyTextRequest {
   // Input document.
-  Document document = 1;
+  Document document = 1 [(google.api.field_behavior) = REQUIRED];
 }
 
 // The document classification response message.
@@ -1046,10 +1083,10 @@ message AnnotateTextRequest {
   }
 
   // Input document.
-  Document document = 1;
+  Document document = 1 [(google.api.field_behavior) = REQUIRED];
 
   // The enabled features.
-  Features features = 2;
+  Features features = 2 [(google.api.field_behavior) = REQUIRED];
 
   // The encoding type used by the API to calculate offsets.
   EncodingType encoding_type = 3;
@@ -1077,8 +1114,7 @@ message AnnotateTextResponse {
 
   // The language of the text, which will be the same as the language specified
   // in the request or, if not specified, the automatically-detected language.
-  // See [Document.language][google.cloud.language.v1.Document.language] field
-  // for more details.
+  // See [Document.language][google.cloud.language.v1.Document.language] field for more details.
   string language = 5;
 
   // Categories identified in the input document.
diff --git a/packages/google-cloud-language/src/v1/doc/google/cloud/language/v1/doc_language_service.js b/packages/google-cloud-language/src/v1/doc/google/cloud/language/v1/doc_language_service.js
index 0b77e711c24..bb6be889493 100644
--- a/packages/google-cloud-language/src/v1/doc/google/cloud/language/v1/doc_language_service.js
+++ b/packages/google-cloud-language/src/v1/doc/google/cloud/language/v1/doc_language_service.js
@@ -28,6 +28,7 @@
  *
  * @property {string} content
  *   The content of the input in string format.
+ *   Cloud audit logging exempt since it is based on user data.
  *
  * @property {string} gcsContentUri
  *   The Google Cloud Storage URI where the file content is located.
@@ -87,8 +88,8 @@ const Document = {
  *
  * @property {Object} sentiment
  *   For calls to AnalyzeSentiment or if
- *   AnnotateTextRequest.Features.extract_document_sentiment
- *   is set to true, this field will contain the sentiment for the sentence.
+ *   AnnotateTextRequest.Features.extract_document_sentiment is set to
+ *   true, this field will contain the sentiment for the sentence.
  *
  *   This object should have the same structure as [Sentiment]{@link google.cloud.language.v1.Sentiment}
  *
@@ -116,8 +117,9 @@ const Sentence = {
  * @property {Object.<string, string>} metadata
  *   Metadata associated with the entity.
  *
- *   Currently, Wikipedia URLs and Knowledge Graph MIDs are provided, if
- *   available. The associated keys are "wikipedia_url" and "mid", respectively.
+ *   For most entity types, the metadata is a Wikipedia URL (`wikipedia_url`)
+ *   and Knowledge Graph MID (`mid`), if they are available. For the metadata
+ *   associated with other entity types, see the Type table below.
  *
  * @property {number} salience
  *   The salience score associated with the entity in the [0, 1.0] range.
@@ -135,9 +137,9 @@ const Sentence = {
  *
  * @property {Object} sentiment
  *   For calls to AnalyzeEntitySentiment or if
- *   AnnotateTextRequest.Features.extract_entity_sentiment
- *   is set to true, this field will contain the aggregate sentiment expressed
- *   for this entity in the provided document.
+ *   AnnotateTextRequest.Features.extract_entity_sentiment is set to
+ *   true, this field will contain the aggregate sentiment expressed for this
+ *   entity in the provided document.
  *
  *   This object should have the same structure as [Sentiment]{@link google.cloud.language.v1.Sentiment}
  *
@@ -149,7 +151,10 @@ const Entity = {
   // This is for documentation. Actual contents will be loaded by gRPC.
 
   /**
-   * The type of the entity.
+   * The type of the entity. For most entity types, the associated metadata is a
+   * Wikipedia URL (`wikipedia_url`) and Knowledge Graph MID (`mid`). The table
+   * below lists the associated fields for entities that have different
+   * metadata.
    *
    * @enum {number}
    * @memberof google.cloud.language.v1
@@ -182,42 +187,67 @@ const Entity = {
     EVENT: 4,
 
     /**
-     * Work of art
+     * Artwork
      */
     WORK_OF_ART: 5,
 
     /**
-     * Consumer goods
+     * Consumer product
      */
     CONSUMER_GOOD: 6,
 
     /**
-     * Other types
+     * Other types of entities
      */
     OTHER: 7,
 
     /**
-     * Phone number
+     * Phone number<br><br>
+     * The metadata lists the phone number, formatted according to local
+     * convention, plus whichever additional elements appear in the text:<ul>
+     * <li><code>number</code> &ndash; the actual number, broken down into
+     * sections as per local convention</li> <li><code>national_prefix</code>
+     * &ndash; country code, if detected</li> <li><code>area_code</code> &ndash;
+     * region or area code, if detected</li> <li><code>extension</code> &ndash;
+     * phone extension (to be dialed after connection), if detected</li></ul>
      */
     PHONE_NUMBER: 9,
 
     /**
-     * Address
+     * Address<br><br>
+     * The metadata identifies the street number and locality plus whichever
+     * additional elements appear in the text:<ul>
+     * <li><code>street_number</code> &ndash; street number</li>
+     * <li><code>locality</code> &ndash; city or town</li>
+     * <li><code>street_name</code> &ndash; street/route name, if detected</li>
+     * <li><code>postal_code</code> &ndash; postal code, if detected</li>
+     * <li><code>country</code> &ndash; country, if detected</li>
+     * <li><code>broad_region</code> &ndash; administrative area, such as the
+     * state, if detected</li> <li><code>narrow_region</code> &ndash; smaller
+     * administrative area, such as county, if detected</li>
+     * <li><code>sublocality</code> &ndash; used in Asian addresses to demark a
+     * district within a city, if detected</li></ul>
      */
     ADDRESS: 10,
 
     /**
-     * Date
+     * Date<br><br>
+     * The metadata identifies the components of the date:<ul>
+     * <li><code>year</code> &ndash; four digit year, if detected</li>
+     * <li><code>month</code> &ndash; two digit month number, if detected</li>
+     * <li><code>day</code> &ndash; two digit day number, if detected</li></ul>
      */
     DATE: 11,
 
     /**
-     * Number
+     * Number<br><br>
+     * The metadata is the number itself.
      */
     NUMBER: 12,
 
     /**
-     * Price
+     * Price<br><br>
+     * The metadata identifies the <code>value</code> and <code>currency</code>.
      */
     PRICE: 13
   }
@@ -1336,9 +1366,9 @@ const DependencyEdge = {
  *
  * @property {Object} sentiment
  *   For calls to AnalyzeEntitySentiment or if
- *   AnnotateTextRequest.Features.extract_entity_sentiment
- *   is set to true, this field will contain the sentiment expressed for this
- *   mention of the entity in the provided document.
+ *   AnnotateTextRequest.Features.extract_entity_sentiment is set to
+ *   true, this field will contain the sentiment expressed for this mention of
+ *   the entity in the provided document.
  *
  *   This object should have the same structure as [Sentiment]{@link google.cloud.language.v1.Sentiment}
  *
@@ -1382,9 +1412,7 @@ const EntityMention = {
  *
  * @property {number} beginOffset
  *   The API calculates the beginning offset of the content in the original
- *   document according to the
- *   EncodingType specified in the API
- *   request.
+ *   document according to the EncodingType specified in the API request.
  *
  * @typedef TextSpan
  * @memberof google.cloud.language.v1
@@ -1445,8 +1473,7 @@ const AnalyzeSentimentRequest = {
  * @property {string} language
  *   The language of the text, which will be the same as the language specified
  *   in the request or, if not specified, the automatically-detected language.
- *   See Document.language field
- *   for more details.
+ *   See Document.language field for more details.
  *
  * @property {Object[]} sentences
  *   The sentiment for all the sentences in the document.
@@ -1493,8 +1520,7 @@ const AnalyzeEntitySentimentRequest = {
  * @property {string} language
  *   The language of the text, which will be the same as the language specified
  *   in the request or, if not specified, the automatically-detected language.
- *   See Document.language field
- *   for more details.
+ *   See Document.language field for more details.
  *
  * @typedef AnalyzeEntitySentimentResponse
  * @memberof google.cloud.language.v1
@@ -1536,8 +1562,7 @@ const AnalyzeEntitiesRequest = {
  * @property {string} language
  *   The language of the text, which will be the same as the language specified
  *   in the request or, if not specified, the automatically-detected language.
- *   See Document.language field
- *   for more details.
+ *   See Document.language field for more details.
  *
  * @typedef AnalyzeEntitiesResponse
  * @memberof google.cloud.language.v1
@@ -1584,8 +1609,7 @@ const AnalyzeSyntaxRequest = {
  * @property {string} language
  *   The language of the text, which will be the same as the language specified
  *   in the request or, if not specified, the automatically-detected language.
- *   See Document.language field
- *   for more details.
+ *   See Document.language field for more details.
  *
  * @typedef AnalyzeSyntaxResponse
  * @memberof google.cloud.language.v1
@@ -1713,8 +1737,7 @@ const AnnotateTextRequest = {
  * @property {string} language
  *   The language of the text, which will be the same as the language specified
  *   in the request or, if not specified, the automatically-detected language.
- *   See Document.language field
- *   for more details.
+ *   See Document.language field for more details.
  *
  * @property {Object[]} categories
  *   Categories identified in the input document.
diff --git a/packages/google-cloud-language/src/v1/language_service_client.js b/packages/google-cloud-language/src/v1/language_service_client.js
index c06ac2f8de8..994ea7d362a 100644
--- a/packages/google-cloud-language/src/v1/language_service_client.js
+++ b/packages/google-cloud-language/src/v1/language_service_client.js
@@ -291,10 +291,8 @@ class LanguageServiceClient {
   }
 
   /**
-   * Finds entities, similar to
-   * AnalyzeEntities
-   * in the text and analyzes sentiment associated with each entity and its
-   * mentions.
+   * Finds entities, similar to AnalyzeEntities in the text and analyzes
+   * sentiment associated with each entity and its mentions.
    *
    * @param {Object} request
    *   The request object that will be sent.
diff --git a/packages/google-cloud-language/synth.metadata b/packages/google-cloud-language/synth.metadata
index 3642d502c07..81398c4b8a7 100644
--- a/packages/google-cloud-language/synth.metadata
+++ b/packages/google-cloud-language/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-03-22T11:16:51.183804Z",
+  "updateTime": "2019-04-04T11:16:12.440846Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.18",
-        "dockerImage": "googleapis/artman@sha256:e8ac9200640e76d54643f370db71a1556bf254f565ce46b45a467bbcbacbdb37"
+        "version": "0.16.23",
+        "dockerImage": "googleapis/artman@sha256:f3a3f88000dc1cd1b4826104c5574aa5c534f6793fbf66e888d11c0d7ef5762e"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "e2a116ac081210002ec2e634f1f840a453ebd182",
-        "internalRef": "239695990"
+        "sha": "04193ea2f8121388c998ab49c382f2c03417dcce",
+        "internalRef": "241828309"
       }
     },
     {