diff --git a/go/web-service-gin/main.go b/go/web-service-gin/main.go
index 640aa13..44005dc 100644
--- a/go/web-service-gin/main.go
+++ b/go/web-service-gin/main.go
@@ -1,5 +1,7 @@
 package main
 
+// https://go.dev/doc/tutorial/web-service-gin
+
 import (
 	"net/http"