D5928.id15325.diff
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	Index: head/sbin/tunefs/tunefs.8
	===================================================================
	--- head/sbin/tunefs/tunefs.8
	+++ head/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 @@
	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