diff --git a/man/feh.pre b/man/feh.pre
index eff1241b7ecc21fa133169341118f63f1f4a4490..2907bb2dca3de0d56f175f22fc6bf083652c4246 100644
--- a/man/feh.pre
+++ b/man/feh.pre
@@ -1414,6 +1414,11 @@ Zoom to 100%
 .
 Zoom to fit the window size
 .
+.It Ao keypad 5 Ac Bq zoom_fill
+.
+Zoom to fill the window size like
+.Cm --bg-fill
+.
 .El
 .
 .Ss MENU KEYS