diff --git a/python/paddle/v2/fluid/layers/io.py b/python/paddle/v2/fluid/layers/io.py
index bc804a40434f3a392b54d2131dc7ed07ec01510f..b7b2cf2296cc8868dd0b5eb6cd6d58b9ae795d5d 100644
--- a/python/paddle/v2/fluid/layers/io.py
+++ b/python/paddle/v2/fluid/layers/io.py
@@ -113,7 +113,8 @@ class ListenAndServ(object):
         self.outputs = []
         self.endpoint = endpoint
         self.fan_in = fan_in
-        # FIXME(typhoonzero): Add this switch is stupid
+        # FIXME(typhoonzero): add optimizer_mode is stupid, should make it more
+        # general.
         self.optimizer_mode = optimizer_mode
 
     def do(self):