diff --git a/todo.txt b/todo.txt
index 6e0a5f0f4..743f60751 100644
--- a/todo.txt
+++ b/todo.txt
@@ -48,3 +48,5 @@ TODO, which will get actually done
 - OpenTTD: tutorial.
 
 - Add glshim library: https://github.com/lunixbochs/glshim
+
+- OpenTTD: horizintal toobar popup menu out of screen.