diff --git a/python/paddle/fluid/layers/control_flow.py b/python/paddle/fluid/layers/control_flow.py
index 51fad6e68c975b688768a953166553a4b78e49a3..80e8ff484a4c04df1b41bbca284d7c604962934c 100644
--- a/python/paddle/fluid/layers/control_flow.py
+++ b/python/paddle/fluid/layers/control_flow.py
@@ -736,7 +736,7 @@ def max_sequence_len(rank_table):
         rank_table(${rank_table_type}): ${rank_table_comment}.
 
     Returns:
-        (${out_type}): ${out_comment}.
+        ${out_comment}.
     """
     helper = LayerHelper("max_seqence_len", **locals())
     res = helper.create_tmp_variable(dtype="int64")