diff --git a/python/paddle/v2/dataset/sentiment.py b/python/paddle/v2/dataset/sentiment.py
index 1e7f222f4d299d4a1156fecda30b9e1e9b202ca0..137aa6aea768fcc1c165cbc8bc6fdfe4aec58c32 100644
--- a/python/paddle/v2/dataset/sentiment.py
+++ b/python/paddle/v2/dataset/sentiment.py
@@ -102,7 +102,7 @@ def load_sentiment_data():
 
 def reader_creator(data):
     """
-    Reader creator, it format data set to numpy
+    Reader creator, generate an iterator for data set
     :param data:
         train data set or test data set
     """
diff --git a/python/paddle/v2/dataset/tests/test_sentiment.py b/python/paddle/v2/dataset/tests/test_sentiment.py
index 48a14aad2a9fd1068ddabcac0c8c9ea005151ee4..407405290734609059c1767600748d530e8a13a6 100644
--- a/python/paddle/v2/dataset/tests/test_sentiment.py
+++ b/python/paddle/v2/dataset/tests/test_sentiment.py
@@ -1,3 +1,6 @@
+# /usr/bin/env python
+# -*- coding:utf-8 -*-
+
 # Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
 #
 # Licensed under the Apache License, Version 2.0 (the "License");