mkfs.btrfs -O list-all is a good options to list features,
publish it in the help.

Signed-off-by: Anand Jain <[email protected]>
---
 mkfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mkfs.c b/mkfs.c
index 14e0fed..c16aeb9 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -281,7 +281,7 @@ static void print_usage(void)
        fprintf(stderr, "\t-s|--sectorsize SIZE    min block allocation (may 
not mountable by current kernel)\n");
        fprintf(stderr, "\t-r|--rootdir DIR        the source directory\n");
        fprintf(stderr, "\t-K|--nodiscard          do not perform whole device 
TRIM\n");
-       fprintf(stderr, "\t-O|--features LIST      comma separated list of 
filesystem features\n");
+       fprintf(stderr, "\t-O|--features LIST      comma separated list of 
filesystem features, use '-O list-all' to list features\n");
        fprintf(stderr, "\t-U|--uuid UUID          specify the filesystem 
UUID\n");
        fprintf(stderr, "\t-V|--version            print the mkfs.btrfs version 
and exit\n");
        fprintf(stderr, "%s\n", PACKAGE_STRING);
-- 
2.4.1

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