diff --git a/redo/future b/redo/future
index e62fa4b..066d32d 100644
--- a/redo/future
+++ b/redo/future
@@ -63,5 +63,6 @@ windows
 	- not all controls are transparent
 gtk+
 	- Area: figure out how Enter is processed in Entry
+		https://git.gnome.org/browse/gtk+/tree/gtk/gtkwindow.c#n1229
 all
 	- make spaced settable somehow