From 0a0c18180cfe5adf0017a7481f1eddda10fe1917 Mon Sep 17 00:00:00 2001
From: Mateusz Piotrowski <0mp@FreeBSD.org>
Date: Thu, 18 Jun 2020 23:12:55 +0000
Subject: [PATCH] Document that umount -A does not unmount /dev

Reported by:	kaktus
Reviewed by:	kaktus
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D25351
---
 sbin/umount/umount.8 | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/sbin/umount/umount.8 b/sbin/umount/umount.8
index abf1e6eed484..00edb9c3599f 100644
--- a/sbin/umount/umount.8
+++ b/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
@@ -69,8 +69,11 @@ All the file systems described in
 .Xr fstab 5
 are unmounted.
 .It Fl A
-All the currently mounted file systems except
-the root are unmounted.
+All the currently mounted file systems are unmounted,
+except for those mounted at
+.Pa /
+or
+.Pa /dev .
 .It Fl F Ar fstab
 Specify the
 .Pa fstab