diff --git a/windows/uipriv_windows.hpp b/windows/uipriv_windows.hpp
index 21f8ac28..e62aa464 100644
--- a/windows/uipriv_windows.hpp
+++ b/windows/uipriv_windows.hpp
@@ -13,6 +13,7 @@ enum {
 	msgNOTIFY,
 	msgHSCROLL,
 	msgQueued,
+	// TODO convert to a function like with container
 	msgD2DScratchPaint,
 };