diff --git a/super0.c b/super0.c
index 2ca127e..b1ad47a 100644
--- a/super0.c
+++ b/super0.c
@@ -791,7 +791,7 @@ static int load_super0(struct supertype *st, int fd, char *devname)
 
 	if (st->ss == NULL) {
 		st->ss = &super0;
-		st->minor_version = 90;
+		st->minor_version = super->minor_version;
 		st->max_devs = MD_SB_DISKS;
 	}
 
@@ -830,6 +830,7 @@ static struct supertype *match_metadata_desc0(char *arg)
 	st->sb = NULL;
 	if (strcmp(arg, "0") == 0 ||
 	    strcmp(arg, "0.90") == 0 ||
+	    strcmp(arg, "0.91") == 0 ||
 	    strcmp(arg, "default") == 0
 		)
 		return st;