diff --git a/protos/google/cloud/translate/v3/translation_service.proto b/protos/google/cloud/translate/v3/translation_service.proto
index 070786ce..9f770248 100644
--- a/protos/google/cloud/translate/v3/translation_service.proto
+++ b/protos/google/cloud/translate/v3/translation_service.proto
@@ -123,6 +123,8 @@ service TranslationService {
       post: "/v3/{parent=projects/*/locations/*}:batchTranslateDocument"
       body: "*"
     };
+    option (google.api.method_signature) =
+        "parent,source_language_code,target_language_codes,input_configs,output_config";
     option (google.longrunning.operation_info) = {
       response_type: "BatchTranslateDocumentResponse"
       metadata_type: "BatchTranslateDocumentMetadata"
diff --git a/protos/google/cloud/translate/v3beta1/translation_service.proto b/protos/google/cloud/translate/v3beta1/translation_service.proto
index 03386518..362d3ef3 100644
--- a/protos/google/cloud/translate/v3beta1/translation_service.proto
+++ b/protos/google/cloud/translate/v3beta1/translation_service.proto
@@ -120,6 +120,8 @@ service TranslationService {
       post: "/v3beta1/{parent=projects/*/locations/*}:batchTranslateDocument"
       body: "*"
     };
+    option (google.api.method_signature) =
+        "parent,source_language_code,target_language_codes,input_configs,output_config";
     option (google.longrunning.operation_info) = {
       response_type: "BatchTranslateDocumentResponse"
       metadata_type: "BatchTranslateDocumentMetadata"
diff --git a/protos/protos.json b/protos/protos.json
index 7251001d..c43468de 100644
--- a/protos/protos.json
+++ b/protos/protos.json
@@ -147,6 +147,7 @@
                           "options": {
                             "(google.api.http).post": "/v3/{parent=projects/*/locations/*}:batchTranslateDocument",
                             "(google.api.http).body": "*",
+                            "(google.api.method_signature)": "parent,source_language_code,target_language_codes,input_configs,output_config",
                             "(google.longrunning.operation_info).response_type": "BatchTranslateDocumentResponse",
                             "(google.longrunning.operation_info).metadata_type": "BatchTranslateDocumentMetadata"
                           },
@@ -157,6 +158,9 @@
                                 "body": "*"
                               }
                             },
+                            {
+                              "(google.api.method_signature)": "parent,source_language_code,target_language_codes,input_configs,output_config"
+                            },
                             {
                               "(google.longrunning.operation_info)": {
                                 "response_type": "BatchTranslateDocumentResponse",
@@ -1412,6 +1416,7 @@
                           "options": {
                             "(google.api.http).post": "/v3beta1/{parent=projects/*/locations/*}:batchTranslateDocument",
                             "(google.api.http).body": "*",
+                            "(google.api.method_signature)": "parent,source_language_code,target_language_codes,input_configs,output_config",
                             "(google.longrunning.operation_info).response_type": "BatchTranslateDocumentResponse",
                             "(google.longrunning.operation_info).metadata_type": "BatchTranslateDocumentMetadata"
                           },
@@ -1422,6 +1427,9 @@
                                 "body": "*"
                               }
                             },
+                            {
+                              "(google.api.method_signature)": "parent,source_language_code,target_language_codes,input_configs,output_config"
+                            },
                             {
                               "(google.longrunning.operation_info)": {
                                 "response_type": "BatchTranslateDocumentResponse",