diff --git a/protos/google/datastore/v1/query.proto b/protos/google/datastore/v1/query.proto
index 40ade72a3..d1f0f8d07 100644
--- a/protos/google/datastore/v1/query.proto
+++ b/protos/google/datastore/v1/query.proto
@@ -279,8 +279,13 @@ message KindExpression {
 
 // A reference to a property relative to the kind expressions.
 message PropertyReference {
-  // The name of the property.
-  // If name includes "."s, it may be interpreted as a property name path.
+  // A reference to a property.
+  //
+  // Requires:
+  //
+  // * MUST be a dot-delimited (`.`) string of segments, where each segment
+  // conforms to [entity property name][google.datastore.v1.Entity.properties]
+  // limitations.
   string name = 2;
 }
 
diff --git a/src/v1/datastore_admin_client.ts b/src/v1/datastore_admin_client.ts
index 2442e3c14..3a82a0ae0 100644
--- a/src/v1/datastore_admin_client.ts
+++ b/src/v1/datastore_admin_client.ts
@@ -138,8 +138,7 @@ export class DatastoreAdminClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
@@ -147,7 +146,7 @@ export class DatastoreAdminClient {
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new DatastoreAdminClient({fallback: 'rest'}, gax);
+   *     const client = new DatastoreAdminClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -213,7 +212,7 @@ export class DatastoreAdminClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
@@ -241,7 +240,7 @@ export class DatastoreAdminClient {
       auth: this.auth,
       grpc: 'grpc' in this._gaxGrpc ? this._gaxGrpc.grpc : undefined,
     };
-    if (opts.fallback === 'rest') {
+    if (opts.fallback) {
       lroOptions.protoJson = protoFilesRoot;
       lroOptions.httpRules = [
         {
diff --git a/src/v1/datastore_client.ts b/src/v1/datastore_client.ts
index 19ddc994d..80d119133 100644
--- a/src/v1/datastore_client.ts
+++ b/src/v1/datastore_client.ts
@@ -95,8 +95,7 @@ export class DatastoreClient {
    *     API remote host.
    * @param {gax.ClientConfig} [options.clientConfig] - Client configuration override.
    *     Follows the structure of {@link gapicConfig}.
-   * @param {boolean | "rest"} [options.fallback] - Use HTTP fallback mode.
-   *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
+   * @param {boolean} [options.fallback] - Use HTTP/1.1 REST mode.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
    * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
@@ -104,7 +103,7 @@ export class DatastoreClient {
    *     HTTP implementation. Load only fallback version and pass it to the constructor:
    *     ```
    *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
-   *     const client = new DatastoreClient({fallback: 'rest'}, gax);
+   *     const client = new DatastoreClient({fallback: true}, gax);
    *     ```
    */
   constructor(
@@ -170,7 +169,7 @@ export class DatastoreClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
-    } else if (opts.fallback === 'rest') {
+    } else {
       clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
@@ -187,7 +186,7 @@ export class DatastoreClient {
       auth: this.auth,
       grpc: 'grpc' in this._gaxGrpc ? this._gaxGrpc.grpc : undefined,
     };
-    if (opts.fallback === 'rest') {
+    if (opts.fallback) {
       lroOptions.protoJson = protoFilesRoot;
       lroOptions.httpRules = [
         {