diff --git a/sys/src/cmd/mothra/mothra.c b/sys/src/cmd/mothra/mothra.c
index 79e6191d2..1206407eb 100644
--- a/sys/src/cmd/mothra/mothra.c
+++ b/sys/src/cmd/mothra/mothra.c
@@ -284,7 +284,7 @@ void main(int argc, char *argv[]){
 	switch(argc){
 	default:
 	Usage:
-		fprint(2, "Usage: %s [-d] [-m mtpt] [url]\n", argv[0]);
+		fprint(2, "Usage: %s [-dv] [-m mtpt] [url]\n", argv0);
 		exits("usage");
 	case 0:
 		url=getenv("url");