btrfs-progs: update manpage for btrfs-image with -m option added

The btrfs-image support multiple devices with -m specified.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/btrfs-image.c b/btrfs-image.c
index 3ca3b400..c9dd0232 100644
--- a/btrfs-image.c
+++ b/btrfs-image.c
@@ -2446,6 +2446,7 @@ static void print_usage(void)
 	fprintf(stderr, "\t-o      \tdon't mess with the chunk tree when restoring\n");
 	fprintf(stderr, "\t-s      \tsanitize file names, use once to just use garbage, use twice if you want crc collisions\n");
 	fprintf(stderr, "\t-w      \twalk all trees instead of using extent tree, do this if your extent tree is broken\n");
+	fprintf(stderr, "\t-m	   \trestore for multiple devices\n");
 	exit(1);
 }