diff --git a/cmd/root.go b/cmd/root.go
index 2b7b040..12bd8ee 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -39,5 +39,5 @@ func Execute() {
 }
 
 func init() {
-	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is ./test-server.yaml)")
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "test-server.yaml", "config file")
 }