diff --git a/python/paddle_serving_client/general_python_service.proto b/python/paddle_serving_client/general_python_service.proto
index 5613558663f3f61b3ad8e9f1aed35cda6afa98d3..7f3af66df8d011b9a0a4fbcd9fb14a704f0c4bb2 100644
--- a/python/paddle_serving_client/general_python_service.proto
+++ b/python/paddle_serving_client/general_python_service.proto
@@ -26,4 +26,6 @@ message Request {
 message Response {
   repeated bytes fetch_insts = 1;
   repeated string fetch_var_names = 2;
+  required int32 is_error = 3;
+  optional string error_info = 4;
 }