diff --git a/quad/.gitignore b/quad/.gitignore
index f63d273d..f3f166ce 100644
--- a/quad/.gitignore
+++ b/quad/.gitignore
@@ -28,3 +28,4 @@ quad/scribblings/racket.css
 quad/scribblings/scribble-common.js
 quad/scribblings/scribble.css
 quad/scribblings/pict*.png
+quad/scribblings/mb.css