diff --git a/paddle/operators/math/detail/gru_kernel.h b/paddle/operators/math/detail/gru_kernel.h
index 80cf7f3870aba6a4a613955f0690893987621779..8a681d8d8bced72e1296f863489f6ccbc7913167 100644
--- a/paddle/operators/math/detail/gru_kernel.h
+++ b/paddle/operators/math/detail/gru_kernel.h
@@ -17,6 +17,7 @@ limitations under the License. */
 
 #include <type_traits>
 
+// TODO(guosheng): refine code style in gru_kernel
 namespace paddle {
 namespace operators {
 namespace math {
diff --git a/paddle/operators/math/gru_compute.h b/paddle/operators/math/gru_compute.h
index 4e0a7779da8d7ec80a04a0f74dcebf4d11c740a8..1475fb38104f353857dfd968e46af98a6d52c52a 100644
--- a/paddle/operators/math/gru_compute.h
+++ b/paddle/operators/math/gru_compute.h
@@ -19,6 +19,7 @@ namespace paddle {
 namespace operators {
 namespace math {
 
+// TODO(guosheng): refine code style in gru_compute
 template <typename T>
 struct hl_gru_value {
   T *gateWeight;