diff --git a/protos/google/cloud/documentai/v1/document_processor_service.proto b/protos/google/cloud/documentai/v1/document_processor_service.proto
index 65f0e6d96..314a51d9a 100644
--- a/protos/google/cloud/documentai/v1/document_processor_service.proto
+++ b/protos/google/cloud/documentai/v1/document_processor_service.proto
@@ -298,4 +298,7 @@ message ReviewDocumentResponse {
 message ReviewDocumentOperationMetadata {
   // The basic metadata of the long running operation.
   CommonOperationMetadata common_metadata = 5;
+
+  // The question ID.
+  string question_id = 6;
 }
diff --git a/protos/protos.d.ts b/protos/protos.d.ts
index bce47fd32..df591e898 100644
--- a/protos/protos.d.ts
+++ b/protos/protos.d.ts
@@ -5608,6 +5608,9 @@ export namespace google {
 
                     /** ReviewDocumentOperationMetadata commonMetadata */
                     commonMetadata?: (google.cloud.documentai.v1.ICommonOperationMetadata|null);
+
+                    /** ReviewDocumentOperationMetadata questionId */
+                    questionId?: (string|null);
                 }
 
                 /** Represents a ReviewDocumentOperationMetadata. */
@@ -5622,6 +5625,9 @@ export namespace google {
                     /** ReviewDocumentOperationMetadata commonMetadata. */
                     public commonMetadata?: (google.cloud.documentai.v1.ICommonOperationMetadata|null);
 
+                    /** ReviewDocumentOperationMetadata questionId. */
+                    public questionId: string;
+
                     /**
                      * Creates a new ReviewDocumentOperationMetadata instance using the specified properties.
                      * @param [properties] Properties to set
diff --git a/protos/protos.js b/protos/protos.js
index 6b96278a9..f9dff874b 100644
--- a/protos/protos.js
+++ b/protos/protos.js
@@ -14296,6 +14296,7 @@
                          * @memberof google.cloud.documentai.v1
                          * @interface IReviewDocumentOperationMetadata
                          * @property {google.cloud.documentai.v1.ICommonOperationMetadata|null} [commonMetadata] ReviewDocumentOperationMetadata commonMetadata
+                         * @property {string|null} [questionId] ReviewDocumentOperationMetadata questionId
                          */
     
                         /**
@@ -14321,6 +14322,14 @@
                          */
                         ReviewDocumentOperationMetadata.prototype.commonMetadata = null;
     
+                        /**
+                         * ReviewDocumentOperationMetadata questionId.
+                         * @member {string} questionId
+                         * @memberof google.cloud.documentai.v1.ReviewDocumentOperationMetadata
+                         * @instance
+                         */
+                        ReviewDocumentOperationMetadata.prototype.questionId = "";
+    
                         /**
                          * Creates a new ReviewDocumentOperationMetadata instance using the specified properties.
                          * @function create
@@ -14347,6 +14356,8 @@
                                 writer = $Writer.create();
                             if (message.commonMetadata != null && Object.hasOwnProperty.call(message, "commonMetadata"))
                                 $root.google.cloud.documentai.v1.CommonOperationMetadata.encode(message.commonMetadata, writer.uint32(/* id 5, wireType 2 =*/42).fork()).ldelim();
+                            if (message.questionId != null && Object.hasOwnProperty.call(message, "questionId"))
+                                writer.uint32(/* id 6, wireType 2 =*/50).string(message.questionId);
                             return writer;
                         };
     
@@ -14384,6 +14395,9 @@
                                 case 5:
                                     message.commonMetadata = $root.google.cloud.documentai.v1.CommonOperationMetadata.decode(reader, reader.uint32());
                                     break;
+                                case 6:
+                                    message.questionId = reader.string();
+                                    break;
                                 default:
                                     reader.skipType(tag & 7);
                                     break;
@@ -14424,6 +14438,9 @@
                                 if (error)
                                     return "commonMetadata." + error;
                             }
+                            if (message.questionId != null && message.hasOwnProperty("questionId"))
+                                if (!$util.isString(message.questionId))
+                                    return "questionId: string expected";
                             return null;
                         };
     
@@ -14444,6 +14461,8 @@
                                     throw TypeError(".google.cloud.documentai.v1.ReviewDocumentOperationMetadata.commonMetadata: object expected");
                                 message.commonMetadata = $root.google.cloud.documentai.v1.CommonOperationMetadata.fromObject(object.commonMetadata);
                             }
+                            if (object.questionId != null)
+                                message.questionId = String(object.questionId);
                             return message;
                         };
     
@@ -14460,10 +14479,14 @@
                             if (!options)
                                 options = {};
                             var object = {};
-                            if (options.defaults)
+                            if (options.defaults) {
                                 object.commonMetadata = null;
+                                object.questionId = "";
+                            }
                             if (message.commonMetadata != null && message.hasOwnProperty("commonMetadata"))
                                 object.commonMetadata = $root.google.cloud.documentai.v1.CommonOperationMetadata.toObject(message.commonMetadata, options);
+                            if (message.questionId != null && message.hasOwnProperty("questionId"))
+                                object.questionId = message.questionId;
                             return object;
                         };
     
diff --git a/protos/protos.json b/protos/protos.json
index 935b4e3a1..79bf712a0 100644
--- a/protos/protos.json
+++ b/protos/protos.json
@@ -1299,6 +1299,10 @@
                         "commonMetadata": {
                           "type": "CommonOperationMetadata",
                           "id": 5
+                        },
+                        "questionId": {
+                          "type": "string",
+                          "id": 6
                         }
                       }
                     },