diff --git a/mount.c b/mount.c
index 04953c6..59c27d6 100644
--- a/mount.c
+++ b/mount.c
@@ -36,7 +36,7 @@ static struct option {
 static void
 usage(void)
 {
-	eprintf("usage: %s [-BMRd] [-t fstype] [-o options] source target\n",
+	eprintf("usage: %s [-BMRdn] [-t fstype] [-o options] source target\n",
 		argv0);
 }
 
diff --git a/umount.c b/umount.c
index 01d5457..540ade7 100644
--- a/umount.c
+++ b/umount.c
@@ -6,7 +6,7 @@
 static void
 usage(void)
 {
-	eprintf("usage: %s [-lf] target\n", argv0);
+	eprintf("usage: %s [-lfn] target\n", argv0);
 }
 
 int