From 41d99db047ce9bdf5f871128e665fdbfb8ca0e9a Mon Sep 17 00:00:00 2001
From: trasz <trasz@FreeBSD.org>
Date: Tue, 19 Apr 2016 15:08:35 +0000
Subject: Mention fsck_ffs -E in tunefs(8). It's non-obvious that one should
 use it after enabling TRIM.

Reviewed by:	brueffer@
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D5928
---
 sbin/tunefs/tunefs.8 | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/sbin/tunefs/tunefs.8 b/sbin/tunefs/tunefs.8
index a58c174..2abe076 100644
--- a/sbin/tunefs/tunefs.8
+++ b/sbin/tunefs/tunefs.8
@@ -28,7 +28,7 @@
 .\"     @(#)tunefs.8	8.2 (Berkeley) 12/11/93
 .\" $FreeBSD$
 .\"
-.Dd June 22, 2011
+.Dd April 19, 2016
 .Dt TUNEFS 8
 .Os
 .Sh NAME
@@ -166,9 +166,15 @@ device for each freed block.
 The trim enable flag is typically set when the underlying device
 uses flash-memory as the device can use the delete command to
 pre-zero or at least avoid copying blocks that have been deleted.
+.Pp
+Note that this does not trim blocks that are already free.
+See the
+.Xr fsck_ffs 8
+.Fl E
+flag.
 .El
 .Pp
-At least one of the above flags is required.
+At least one of these flags is required.
 .Sh FILES
 .Bl -tag -width ".Pa /etc/fstab"
 .It Pa /etc/fstab
-- 
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