diff --git a/cocos/3d/CCMesh.cpp b/cocos/3d/CCMesh.cpp
index 4092600f70..2691c267b7 100644
--- a/cocos/3d/CCMesh.cpp
+++ b/cocos/3d/CCMesh.cpp
@@ -46,10 +46,10 @@ NS_CC_BEGIN
 
 // Helpers
 
-//
+//sampler uniform names, only diffuse and normal texture are supported for now
 std::string s_uniformSamplerName[] =
 {
-    "",//NTextureData::Usage::Unknown
+    "",//NTextureData::Usage::Unknown,
     "",//NTextureData::Usage::None
     "",//NTextureData::Usage::Diffuse
     "",//NTextureData::Usage::Emissive
diff --git a/cocos/3d/CCMesh.h b/cocos/3d/CCMesh.h
index 301908313b..b479fc4bf0 100644
--- a/cocos/3d/CCMesh.h
+++ b/cocos/3d/CCMesh.h
@@ -96,12 +96,12 @@ public:
     int getVertexSizeInBytes() const;
 
     /**
-     * set texture
+     * set diffuse texture
      * @param texPath texture path
      */
     void setTexture(const std::string& texPath);
     /**
-     * set texture
+     * set diffuse texture
      * @param tex texture to be set
      */
     void setTexture(Texture2D* tex);
diff --git a/cocos/3d/CCSprite3D.h b/cocos/3d/CCSprite3D.h
index 77809a4438..87ef5ff41f 100644
--- a/cocos/3d/CCSprite3D.h
+++ b/cocos/3d/CCSprite3D.h
@@ -80,7 +80,7 @@ public:
     
     static void createAsync(const std::string &modelPath, const std::string &texturePath, const std::function<void(Sprite3D*, void*)>& callback, void* callbackparam);
     
-    /**set texture, set the first if multiple textures exist*/
+    /**set diffuse texture, set the first if multiple textures exist*/
     void setTexture(const std::string& texFile);
     void setTexture(Texture2D* texture);