diff --git a/paddle/fluid/operators/listen_and_serv_op.cc b/paddle/fluid/operators/listen_and_serv_op.cc
index 67ee47f9f6767f30aaebe65da494d6f8d1ed896b..b19add24e2bd325896a96be53d3d9762abfe217c 100644
--- a/paddle/fluid/operators/listen_and_serv_op.cc
+++ b/paddle/fluid/operators/listen_and_serv_op.cc
@@ -102,6 +102,7 @@ class ListenAndServOp : public framework::OperatorBase {
 
     framework::Executor executor(dev_place);
 
+    // TODO(qiao) set proper fields for table lookup and update
     rpc_service_->SetExecutor(&executor);
     rpc_service_->SetPrefetchBlkdId(0);
     rpc_service_->SetProgram(program);