Index: sbin/umount/umount.8
===================================================================
--- sbin/umount/umount.8
+++ sbin/umount/umount.8
@@ -28,7 +28,7 @@
 .\"     @(#)umount.8	8.2 (Berkeley) 5/8/95
 .\" $FreeBSD$
 .\"
-.Dd April 14, 2020
+.Dd June 19, 2020
 .Dt UMOUNT 8
 .Os
 .Sh NAME
@@ -70,7 +70,12 @@
 are unmounted.
 .It Fl A
 All the currently mounted file systems except
-the root are unmounted.
+the root and
+.Xr devfs 5
+.Po if mounted at
+.Pa /dev
+.Pc
+are unmounted.
 .It Fl F Ar fstab
 Specify the
 .Pa fstab