diff --git a/user/wxLayout/TODO b/user/wxLayout/TODO
index 00063529a6..7ba72551f0 100644
--- a/user/wxLayout/TODO
+++ b/user/wxLayout/TODO
@@ -16,6 +16,7 @@ BUGS
 TODO
 =====================================================================
 
+Adding many lines makes it terribly slow.
 Printing produces empty pages only.
 
 Formatting of first text in message in M is broken.