diff --git a/doc/fluid/design/async_executor/async_executor.md b/doc/fluid/design/async_executor/async_executor.md
index 8789b22852b8cc882fe5f64d60eb037a30462d11..6891bd306321b9be170eb107992123c47be8d738 100644
--- a/doc/fluid/design/async_executor/async_executor.md
+++ b/doc/fluid/design/async_executor/async_executor.md
@@ -59,7 +59,6 @@ std::vector<float> AsyncExecutor::RunFromFile(
     2) each reader has a Next() iterface, that can fetch an instance
     from the input queue
    */
-  // todo: should be factory method for creating datafeed
   std::vector<std::shared_ptr<DataFeed> > readers;
   PrepareReaders(readers, thread_num, data_feed_desc, filelist);