diff --git a/TODO b/TODO
index c71fe1a8d07110954d6920e5340b1d08a1e00dee..afad5582704b04fab1ba25c683dfadbb9ae78443 100644
--- a/TODO
+++ b/TODO
@@ -26,4 +26,7 @@ Maybe I'll someday find out how to fix that :>
 
 Make --start-at work with paths as well
 
-Fix Memory leaks in the menu (sub-menus apparently never got properly free()d)
+Fix Memory leaks in the menu.
+Sub-menus generated using the callbacks (feh_menu_func_gen_*) don't get
+properly freed. Looks like their background image somehow remains in memory or
+something.