diff --git a/packages/google-cloud-contentwarehouse/README.md b/packages/google-cloud-contentwarehouse/README.md
index 564b5ef1b61..fe6991379c5 100644
--- a/packages/google-cloud-contentwarehouse/README.md
+++ b/packages/google-cloud-contentwarehouse/README.md
@@ -44,7 +44,7 @@ Google APIs Client Libraries, in [Client Libraries Explained][explained].
 1.  [Select or create a Cloud Platform project][projects].
 1.  [Enable billing for your project][billing].
 1.  [Enable the Document AI Warehouse API][enable_api].
-1.  [Set up authentication with a service account][auth] so you can access the
+1.  [Set up authentication][auth] so you can access the
     API from your local workstation.
 
 ### Installing the client library
@@ -212,4 +212,4 @@ See [LICENSE](https://github.com/googleapis/google-cloud-node/blob/main/LICENSE)
 [projects]: https://console.cloud.google.com/project
 [billing]: https://support.google.com/cloud/answer/6293499#enable-billing
 [enable_api]: https://console.cloud.google.com/flows/enableapi?apiid=contentwarehouse.googleapis.com
-[auth]: https://cloud.google.com/docs/authentication/getting-started
+[auth]: https://cloud.google.com/docs/authentication/external/set-up-adc-local
diff --git a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_io.proto b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_io.proto
index a84bfc4fba6..b18537f30b9 100644
--- a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_io.proto
+++ b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_io.proto
@@ -66,7 +66,8 @@ message GcsPrefix {
 
 // The common config to specify a set of documents used as input.
 message BatchDocumentsInputConfig {
-  // The source.
+  // The source. Make sure that the caller of the API has storage.objects.get
+  // access to the buckets.
   oneof source {
     // The set of documents that match the specified Cloud Storage `gcs_prefix`.
     GcsPrefix gcs_prefix = 1;
diff --git a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_processor_service.proto b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_processor_service.proto
index a39ba6ded05..03ca4730266 100644
--- a/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_processor_service.proto
+++ b/packages/google-cloud-contentwarehouse/protos/google/cloud/documentai/v1/document_processor_service.proto
@@ -359,8 +359,9 @@ message ProcessOptions {
   // If a page range is set, only the given pages are extracted and processed
   // from the document. In the output document,
   // [Document.Page.page_number][google.cloud.documentai.v1.Document.Page.page_number]
-  // refers to the page number in the original document. This configuration
-  // only applies to sync requests.
+  // refers to the page number in the original document.
+  // This configuration only applies to online processing with
+  // [ProcessDocument][google.cloud.documentai.v1.DocumentProcessorService.ProcessDocument].
   oneof page_range {
     // Which pages to process (1-indexed).
     IndividualPageSelector individual_page_selector = 5;
diff --git a/packages/google-cloud-contentwarehouse/protos/protos.json b/packages/google-cloud-contentwarehouse/protos/protos.json
index fc996899dc9..0e396e15b38 100644
--- a/packages/google-cloud-contentwarehouse/protos/protos.json
+++ b/packages/google-cloud-contentwarehouse/protos/protos.json
@@ -1,4 +1,7 @@
 {
+  "options": {
+    "syntax": "proto3"
+  },
   "nested": {
     "google": {
       "nested": {