diff --git a/paddle/fluid/operators/detail/send_recv.proto b/paddle/fluid/operators/detail/send_recv.proto
index 0616c1ae1c93e1e88d10698d1278691ca3a3d838..02bb2b9cebb87b83aa1cbef0c644f969b4d17284 100644
--- a/paddle/fluid/operators/detail/send_recv.proto
+++ b/paddle/fluid/operators/detail/send_recv.proto
@@ -21,7 +21,7 @@ service SendRecvService {
   rpc SendVariable(VariableMessage) returns (VoidMessage) {}
   // Argument VariableMessage for GetVariable should only contain varname.
   rpc GetVariable(VariableMessage) returns (VariableMessage) {}
-  // Look up table block execution output variable name.
+  // pre-fetch variable by given variable name and Ids
   rpc PrefetchVariable(VariableMessage) returns (VariableMessage) {}
 }
 
@@ -67,7 +67,7 @@ message VariableMessage {
   bytes serialized = 8;
   // selected_rows data
   bytes rows = 9;
-  // prefetch var name
+  // Look up table block execution output variable name.
   string out_varname = 10;
 }