Document --rootdir mkfs switch

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The --rootdir switch was not documented in the man page

- ---

 man/mkfs.btrfs.8.in |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

index 542e6cf..25e817b 100644

- --- a/man/mkfs.btrfs.8.in
+++ b/man/mkfs.btrfs.8.in
@@ -12,6 +12,7 @@ mkfs.btrfs \- create an btrfs filesystem
[ \fB\-M\fP\fI mixed data+metadata\fP ]
[ \fB\-n\fP\fI nodesize\fP ]
[ \fB\-s\fP\fI sectorsize\fP ]
+[ \fB\-r\fP\fI rootdir\fP ]
[ \fB\-h\fP ]
[ \fB\-V\fP ]
\fI device\fP [ \fIdevice ...\fP ]
@@ -59,6 +60,9 @@ Specify the nodesize. By default the value is set to the pagesize.
\fB\-s\fR, \fB\-\-sectorsize \fIsize\fR
Specify the sectorsize, the minimum block allocation.
.TP
+\fB\-r\fR, \fB\-\-rootdir \fIrootdir\fR
+Specify a directory to copy into the newly created fs.
+.TP
\fB\-V\fR, \fB\-\-version\fR
Print the \fBmkfs.btrfs\fP version and exit.
.SH AVAILABILITY
- --
1.7.5.4

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