diff --git a/src/ScreenDimensions.h b/src/ScreenDimensions.h
index 5d7dcba3c9..818fdd087c 100644
--- a/src/ScreenDimensions.h
+++ b/src/ScreenDimensions.h
@@ -27,6 +27,7 @@ namespace ScreenDimensions
 
 #define FullScreenRectF RectF(SCREEN_LEFT,SCREEN_TOP,SCREEN_RIGHT,SCREEN_BOTTOM)
 
+// XXX: doesn't always have to be 64. -aj
 #define	ARROW_SIZE	(64)
 
 #endif