diff --git a/cocos/3d/CCAnimate3D.h b/cocos/3d/CCAnimate3D.h
index 22b15be72f..152dc83374 100644
--- a/cocos/3d/CCAnimate3D.h
+++ b/cocos/3d/CCAnimate3D.h
@@ -139,7 +139,7 @@ protected:
     EvaluateType _translateEvaluate;
     EvaluateType _roteEvaluate;
     EvaluateType _scaleEvaluate;
-    int _animateQuality;
+    int _animateQuality;        //  0: is low quality 1: is hight quality
     
     std::unordered_map<Bone3D*, Animation3D::Curve*> _boneCurves; //weak ref
     std::unordered_map<Node*, Animation3D::Curve*> _nodeCurves;
diff --git a/cocos/base/CCConfiguration.h b/cocos/base/CCConfiguration.h
index 27034806bc..63d10c4df7 100644
--- a/cocos/base/CCConfiguration.h
+++ b/cocos/base/CCConfiguration.h
@@ -164,7 +164,9 @@ public:
      */
     int getMaxSupportSpotLightInShader() const;
 
-    /** get 3d animate quality*/
+    /** get 3d animate quality
+     *  @return 0: is low quality 1: is hight quality
+     */
     int getAnimate3DQuality() const;
     
     /** Returns whether or not an OpenGL is supported. 
@@ -233,7 +235,7 @@ protected:
     int             _maxDirLightInShader; //max support directional light in shader
     int             _maxPointLightInShader; // max support point light in shader
     int             _maxSpotLightInShader; // max support spot light in shader
-    int             _animate3DQuality;      // 3d animation quality
+    int             _animate3DQuality;      // 3d animation quality; 0: is low quality 1: is hight quality
 	
 	ValueMap        _valueDict;
 };