diff --git a/doc/fluid/design/concepts/python_data_feeding.md b/doc/fluid/design/concepts/python_data_feeding.md
index 0905950413f261a32c7e8bebf5cd4c23103ebbf0..a41d1ad0ca87412e2c137afb1681b0fd8ab23006 100644
--- a/doc/fluid/design/concepts/python_data_feeding.md
+++ b/doc/fluid/design/concepts/python_data_feeding.md
@@ -51,8 +51,8 @@ class PyArrayFeedQueueHolder {
   // `init_once` can only called once, otherwise an exception would raise
   void init_once(size_t capacity, const std::vector<framework::DDim>& dims, const Place& place);
   
-  PyArrayFeedQueue* feeder(); // feeder_.get()
-  const PyArrayFeederQueue* feeder() const; // feeder_.get()
+  PyArrayFeedQueue* feeder() { return feeder_.get(); }
+  const PyArrayFeederQueue* feeder() const { return feeder_.get(); }
  private:
   std::shared_ptr<PyArrayFeedQueue> feeder_;
 };