From 71688f3b71ad9a85483a2e92debf9981ccf3ac84 Mon Sep 17 00:00:00 2001
From: Brad Davis <brd@FreeBSD.org>
Date: Wed, 20 Dec 2017 15:21:29 +0000
Subject: [PATCH] Save others some forehead damange by noting that -r require
 tmpfs.

Reviewed by:	bapt
---
 sbin/reboot/reboot.8 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sbin/reboot/reboot.8 b/sbin/reboot/reboot.8
index 6f2d023e8bb9..6833fdd213a3 100644
--- a/sbin/reboot/reboot.8
+++ b/sbin/reboot/reboot.8
@@ -28,7 +28,7 @@
 .\"	@(#)reboot.8	8.1 (Berkeley) 6/9/93
 .\" $FreeBSD$
 .\"
-.Dd October 23, 2017
+.Dd December 20, 2017
 .Dt REBOOT 8
 .Os
 .Sh NAME
@@ -142,6 +142,9 @@ After changing vfs.root.mountfrom with
 .Xr kenv 1 ,
 .Nm Fl r
 can be used to change the root filesystem while preserving kernel state.
+This requires the
+.Xr tmpfs 5
+kernel module to be loaded.
 .El
 .Pp
 The