improve the description of fs_freq;

prompted by a fix from Warner Losh, freebsd -r193625,
but i chose a different fix;

help/ok otto

1 files changed, 11 insertions, 5 deletions

diff --git a/share/man/man5/fstab.5 b/share/man/man5/fstab.5
index ebe358b3378..86b295b0835 100644
--- a/share/man/man5/fstab.5
+++ b/share/man/man5/fstab.5
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: fstab.5,v 1.41 2007/09/08 09:03:43 henning Exp $
+.\"	$OpenBSD: fstab.5,v 1.42 2009/06/08 17:03:15 jmc Exp $
 .\"	$NetBSD: fstab.5,v 1.5.2.1 1995/11/16 20:11:11 pk Exp $
 .\"
 .\" Copyright (c) 1980, 1989, 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"     @(#)fstab.5	8.1 (Berkeley) 6/5/93
 .\"
-.Dd $Mdocdate: September 8 2007 $
+.Dd $Mdocdate: June 8 2009 $
 .Dt FSTAB 5
 .Os
 .Sh NAME
@@ -211,10 +211,16 @@ This is useful to show disk partitions which are currently unused.
 .Pp
 The fifth field,
 .Fa fs_freq ,
-is used for these filesystems by the
+is used by the
+.Fl W
+and
+.Fl w
+options of
 .Xr dump 8
-command to determine which filesystems need to be dumped.
-If the fifth field is not present, a value of zero is returned and
+to recommend which filesystems should be backed up.
+The value specifies the number of days
+after which a dump is regarded as being old;
+if it is not present, a value of zero is returned and
 .Xr dump 8
 will assume that the filesystem does not need to be dumped.
 .Pp