diff --git a/core/2d/CCParticleSystemQuad.cpp b/core/2d/CCParticleSystemQuad.cpp
index dadeb9d680..515e9e897f 100644
--- a/core/2d/CCParticleSystemQuad.cpp
+++ b/core/2d/CCParticleSystemQuad.cpp
@@ -435,6 +435,8 @@ void ParticleSystemQuad::updateParticleQuads()
         }
         else
         {
+            // TODO: index.isRotated should be treated accordingly
+
             auto& index = _animationIndices.at(*cellIndex);
 
             auto texWidth  = _texture->getPixelsWide();