make clear which arguments are mandatory

1 files changed, 1 insertions, 1 deletions

diff --git a/main.go b/main.go
index 10815a5..05ca229 100644
--- a/main.go
+++ b/main.go
@@ -149,7 +149,7 @@ func main() {
 	flag.Usage = func() {
 		fmt.Fprintf(
 			flag.CommandLine.Output(),
-			"Usage: %s [OPTIONS] [DATABASE] [DOMAIN]\n",
+			"Usage: %s [OPTIONS] DATABASE DOMAIN\n",
 			os.Args[0],
 		)
 		flag.PrintDefaults()