diff --git a/usr.sbin/mixer/mixer.8 b/usr.sbin/mixer/mixer.8
--- a/usr.sbin/mixer/mixer.8
+++ b/usr.sbin/mixer/mixer.8
@@ -21,7 +21,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd March 18, 2022
+.Dd March 20, 2022
 .Dt MIXER 8
 .Os
 .Sh NAME
@@ -139,6 +139,10 @@
 the value following will be used as a relative adjustment, modifying the
 current settings by the amount specified.
 .Pp
+Volume can also be set using the shorthand
+.Ar dev Ns Cm =value .
+This syntax does not apply to other controls.
+.Pp
 The
 .Ar dev Ns Cm .mute
 control (un)mutes a device.