diff --git a/spectrwm.1 b/spectrwm.1
index 9f66f49..759c2db 100644
--- a/spectrwm.1
+++ b/spectrwm.1
@@ -441,6 +441,10 @@ See the
 .Sx KEYBOARD MAPPING FILES
 section below for a list of keyboard mapping files that have been provided
 for several keyboard layouts.
+.Pp
+Note that
+.Pa /dev/null
+can be specified if you only want to clear bindings.
 .It Ic layout
 Select layout to use at start-of-day.
 Defined in the format