diff --git a/mxgrub/mxgrub b/mxgrub/mxgrub
index 5c80f86..330298d 100755
--- a/mxgrub/mxgrub
+++ b/mxgrub/mxgrub
@@ -10,6 +10,7 @@ sub USAGE { return <<"EOF" }
     $0 --list      : list available labels
     $0 --update    : only scan /boot and rewrite grub.cfg
     $0 --initramfs : update /boot/grub/initramfs.igz from /project/admin/initramfs
+    $0 --test      : perform miscellaneous tests (VX50 board)
 EOF
 
 sub sys {