diff --git a/cocos2dx/include/CCUserDefault.h b/cocos2dx/include/CCUserDefault.h
index c4b5d5fc89..1f26729e1a 100644
--- a/cocos2dx/include/CCUserDefault.h
+++ b/cocos2dx/include/CCUserDefault.h
@@ -1,6 +1,5 @@
 /****************************************************************************
 Copyright (c) 2010-2011 cocos2d-x.org
-Copyright (c) 2008-2010 Ricardo Quesada
 
 http://www.cocos2d-x.org
 
@@ -32,23 +31,68 @@ THE SOFTWARE.
 
 NS_CC_BEGIN;
 
+/**
+ * CCUserDefault acts as a tiny database. You can save and get base type values by it.
+ * For example, setBoolForKey("played", true) will add a bool value true into the database.
+ * Its key is "played". You can get the value of the key by getBoolForKey("played").
+ * 
+ * It supports the following base types:
+ * bool, int, float, double, string
+ */
 class CC_DLL CCUserDefault
 {
 public:
 	~CCUserDefault();
 
 	// get value methods
+
+	/**
+	@brief Get bool value by key, if the key doesn't exist, a default value will return.
+	 You can set the default value, or it is false.
+	*/
 	bool	getBoolForKey(const char* pKey, bool defaultValue = false);
+	/**
+	@brief Get integer value by key, if the key doesn't exist, a default value will return.
+	 You can set the default value, or it is 0.
+	*/
 	int		getIntegerForKey(const char* pKey, int defaultValue = 0);
+	/**
+	@brief Get float value by key, if the key doesn't exist, a default value will return.
+	 You can set the default value, or it is 0.0f.
+	*/
 	float	getFloatForKey(const char* pKey, float defaultValue=0.0f);
+	/**
+	@brief Get double value by key, if the key doesn't exist, a default value will return.
+	 You can set the default value, or it is 0.0.
+	*/
 	double  getDoubleForKey(const char* pKey, double defaultValue=0.0);
+	/**
+	@brief Get string value by key, if the key doesn't exist, a default value will return.
+	You can set the default value, or it is "".
+	*/
 	std::string getStringForKey(const char* pKey, const std::string & defaultValue = "");
 
 	// set value methods
+
+	/**
+	@brief Set bool value by key.
+	*/
 	void	setBoolForKey(const char* pKey, bool value);
+	/**
+	@brief Set integer value by key.
+	*/
 	void	setIntegerForKey(const char* pKey, int value);
+	/**
+	@brief Set float value by key.
+	*/
 	void	setFloatForKey(const char* pKey, float value);
+	/**
+	@brief Set double value by key.
+	*/
 	void	setDoubleForKey(const char* pKey, double value);
+	/**
+	@brief Set string value by key.
+	*/
 	void	setStringForKey(const char* pKey, const std::string & value);
 
 	static CCUserDefault* sharedUserDefault();
diff --git a/cocos2dx/support/CCUserDefault.cpp b/cocos2dx/support/CCUserDefault.cpp
index e2663e40db..e217479979 100644
--- a/cocos2dx/support/CCUserDefault.cpp
+++ b/cocos2dx/support/CCUserDefault.cpp
@@ -1,3 +1,26 @@
+/****************************************************************************
+Copyright (c) 2010-2011 cocos2d-x.org
+
+http://www.cocos2d-x.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+****************************************************************************/
 #include "CCUserDefault.h"
 #include "platform/CCFileUtils.h"