diff --git a/README.md b/README.md
index 60fce3e..a8c7ab4 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,10 @@ ComfyUI implementation of https://github.com/layerdiffusion/LayerDiffusion.
 
 ![image](https://github.com/huchenlei/ComfyUI-layerdiffusion/assets/20929282/413945a2-0948-405e-b524-e164ba54325d)
 
+
+## Note
+- `Apply Mask to Image` node comes from [comfyui-tooling-nodes](https://github.com/Acly/comfyui-tooling-nodes) package
+
 ## TODO
 - [ ] Foreground conditioning
 - [ ] Background conditioning