From 7c767a44c245ef145644d691fa89319e91610de4 Mon Sep 17 00:00:00 2001
From: minqiyang <minqiyang@baidu.com>
Date: Wed, 26 Sep 2018 13:36:27 +0800
Subject: [PATCH] Polish code

test=develop
---
 python/paddle/fluid/layers/nn.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index 4d8f887cbaa..f4f462ec3bb 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -6689,6 +6689,7 @@ def clip_by_norm(x, max_norm, name=None):
         out = helper.create_variable(
             name=name, dtype=x.dtype, persistable=False)
 
+    # max_norm should always be set
     helper.append_op(
         type="clip_by_norm",
         inputs={"X": x},
-- 
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