diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
index e5f5e94..19f2eb4 100644
--- a/common/cmd_mmc.c
+++ b/common/cmd_mmc.c
@@ -131,7 +131,9 @@
 }
 
 U_BOOT_CMD(mmcinfo, 2, 0, do_mmcinfo,
-	"mmcinfo <dev num>-- display MMC info",
+	"display MMC info",
+	"<dev num>\n
+        "    - device number of the device to dislay info of\n"
 	""
 );