diff --git a/todo.txt b/todo.txt
index 25786a3c4..40d69c518 100644
--- a/todo.txt
+++ b/todo.txt
@@ -45,4 +45,6 @@ TODO, which will get actually done
 
 - OpenTTD: 24bpp color mode + 32bpp blitter in SDL menu.
 
+- OpenTTD: better support for hardware right mouse button.
+
 - Add glshim library: https://github.com/lunixbochs/glshim