From 08069ae68859ded4c6ab5d25f6171ceda56e1e35 Mon Sep 17 00:00:00 2001
From: Brooks Davis <brooks@FreeBSD.org>
Date: Thu, 6 Apr 2017 23:35:10 +0000
Subject: [PATCH] Point out that -F probably does not do what the user expects.

Users attempting to create images from mtree METALOG files created by
installworld often use -F when they should be passing the METALOG file
in place of a directory. This is often produces difficult to debug
error reports.

Reviewed by:	emaste
MFC after:	1 week
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D10038
---
 usr.sbin/makefs/makefs.8 | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/usr.sbin/makefs/makefs.8 b/usr.sbin/makefs/makefs.8
index 918cb04d9b6..7a8e67e465d 100644
--- a/usr.sbin/makefs/makefs.8
+++ b/usr.sbin/makefs/makefs.8
@@ -35,7 +35,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 14, 2016
+.Dd April 6, 2017
 .Dt MAKEFS 8
 .Os
 .Sh NAME
@@ -116,6 +116,12 @@ set in
 .Ar debug-mask .
 XXX: document these
 .It Fl F Ar mtree-specfile
+.Em This is almost certainly not the option you are looking for.
+To create an image from a list of files in an mtree format manifest,
+specify it as the last argument on the commandline, not as a the
+argument to
+.Fl F .
+.Pp
 Use
 .Ar mtree-specfile
 as an