diff --git a/getconf.c b/getconf.c
index 7a96a0d..e21f002 100644
--- a/getconf.c
+++ b/getconf.c
@@ -226,7 +226,7 @@ static const struct var limits_l[] = {
 void
 usage(void)
 {
-	eprintf("%s -v spec arc arco\n", argv0);
+	eprintf("usage: %s -v spec arc arco\n", argv0);
 }
 
 int