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diff --git a/lustre/doc/mkfs.lustre.8 b/lustre/doc/mkfs.lustre.8
index a891bf3..6f17ddb 100644
--- a/lustre/doc/mkfs.lustre.8
+++ b/lustre/doc/mkfs.lustre.8
@@ -1,5 +1,5 @@
 .\" -*- nroff -*-
-.\" Copyright 2008 by Sun Microsystems.  All Rights Reserved.
+.\" Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 .\" This file may be copied under the terms of the GNU Public License.
 .\"
 .TH mkfs.lustre 8 "2008 Mar 15" Lustre "configuration utilities"
@@ -59,7 +59,17 @@ Force a particular OST or MDT index
 Format options for the backing fs. For example, ext3 options could be set here.
 .TP
 .BI \--mountfsoptions= opts
-Set permanent mount options, equivalent to setting in /etc/fstab
+Set the mount options that will be used when mounting the backing fs.
+WARNING: unlike earlier versions of \fBmkfs.lustre\fR, this version completely
+replaces the default mount options with those specified on the command line,
+issuing a warning on stderr if any of the default mount options are omitted.
+The defaults for \fIldiskfs\fR are
+OST: \fIerrors=remount-ro,mballoc,extents\fR;
+MGS/MDT: \fIerrors=remount-ro,iopen_nopriv,user_xattr\fR.
+\fBDO NOT\fR alter the default mount options unless you know what you are doing.
+.TP
+.BI \--network= net,...
+Network(s) to restrict this ost/mdt to. This option can be repeated as desired.
 .TP
 .BI \--mgsnode= nid,...  
 Set the NID(s) of the MGS node, required for all targets other than the MGS.