Add a DIAGNOSTICS section, specifically to address the "Operation not

supported by device" error. Reference options(4). Bump date.

sbin/mount/mount.8

@@ -1,4 +1,4 @@
-.\"	$NetBSD: mount.8,v 1.52 2006/02/12 01:32:06 chs Exp $
+.\"	$NetBSD: mount.8,v 1.53 2006/09/25 20:07:17 elad Exp $
 .\"
 .\" Copyright (c) 1980, 1989, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)mount.8	8.8 (Berkeley) 6/16/94
 .\"
-.Dd February 11, 2006
+.Dd September 25, 2006
 .Dt MOUNT 8
 .Os
 .Sh NAME
@@ -413,9 +413,17 @@ for media using the
 file system format in the first
 .Tn CD-ROM
 drive.
+.Sh DIAGNOSTICS
+The error
+.Dq Operation not supported by device
+indicates that the mount for the specified file-system type cannot be
+completed because the kernel lacks support for the said file-system.
+See
+.Xr options 4
 .Sh SEE ALSO
 .Xr df 1 ,
 .Xr mount 2 ,
+.Xr options 4 ,
 .Xr fstab 5 ,
 .Xr disklabel 8 ,
 .Xr fsck 8 ,