diff --git a/usr.sbin/gstat/gstat.c b/usr.sbin/gstat/gstat.c
index 0c6643c3e3c3..c92f70ea28e2 100644
--- a/usr.sbin/gstat/gstat.c
+++ b/usr.sbin/gstat/gstat.c
@@ -260,7 +260,7 @@ main(int argc, char **argv)
 static void
 usage(void)
 {
-        fprintf(stderr, "usage: gstat [-c] [-I interval]\n");
+        fprintf(stderr, "usage: gstat [-cd] [-I interval]\n");
         exit(1);
         /* NOTREACHED */
 }