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-rw-r--r--sys-utils/fsfreeze.814
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diff --git a/sys-utils/fsfreeze.8 b/sys-utils/fsfreeze.8
index 785cdd9c8..500d311cb 100644
--- a/sys-utils/fsfreeze.8
+++ b/sys-utils/fsfreeze.8
@@ -61,6 +61,20 @@ Display version information and exit.
.TP
.BR \-h , " \-\-help"
Display help text and exit.
+.SH FILESYSTEM SUPPORT
+This command will work only if filesystem supports has support for freezing.
+List of these filesystems include (2016-12-18)
+.BR btrfs ,
+.BR ext2/3/4 ,
+.BR f2fs ,
+.BR jfs ,
+.BR nilfs2 ,
+.BR reiserfs ,
+and
+.BR xfs .
+Previous list may be incomplete, as more filesystems get support. If in
+doubt easiest way to know if a filesystem has support is create a small
+loopback mount and test freezing it.
.SH AUTHOR
.PP
Written by Hajime Taira.