diff --git a/cocos/2d/renderer/Renderer.cpp b/cocos/2d/renderer/Renderer.cpp
index 2c471d8924..23d453ba99 100644
--- a/cocos/2d/renderer/Renderer.cpp
+++ b/cocos/2d/renderer/Renderer.cpp
@@ -178,6 +178,8 @@ void Renderer::render()
 
 void Renderer::drawBatchedQuads()
 {
+    //TODO we can improve the draw performance by inseart material switching command before hand.
+
     int quadsToDraw = 0;
     int startQuad = 0;