diff --git a/sbin/reboot/reboot.c b/sbin/reboot/reboot.c
index 5bc3328a0b93..01c7d38da5a9 100644
--- a/sbin/reboot/reboot.c
+++ b/sbin/reboot/reboot.c
@@ -259,8 +259,8 @@ usage(void)
 {
 
 	(void)fprintf(stderr, dohalt ?
-	    "usage: halt [-lNnpq] [-k kernel]\n" :
-	    "usage: reboot [-dlNnpqr] [-k kernel]\n");
+	    "usage: halt [-clNnpq] [-k kernel]\n" :
+	    "usage: reboot [-cdlNnpqr] [-k kernel]\n");
 	exit(1);
 }
 
diff --git a/sbin/shutdown/shutdown.c b/sbin/shutdown/shutdown.c
index 7a878257a736..f1f780e5d1e8 100644
--- a/sbin/shutdown/shutdown.c
+++ b/sbin/shutdown/shutdown.c
@@ -566,7 +566,7 @@ usage(const char *cp)
 	if (cp != NULL)
 		warnx("%s", cp);
 	(void)fprintf(stderr,
-	    "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]] time [warning-message ...]\n"
+	    "usage: shutdown [-] [-c | -h | -p | -r | -k] [-o [-n]] time [warning-message ...]\n"
 	    "       poweroff\n");
 	exit(1);
 }