diff --git a/docs/docs/tutorials/adding_annotations.md b/docs/docs/tutorials/adding_annotations.md
index bce9c86791c..dc5d6956881 100644
--- a/docs/docs/tutorials/adding_annotations.md
+++ b/docs/docs/tutorials/adding_annotations.md
@@ -117,7 +117,9 @@ import (
 	helloworldpb "github.com/myuser/myrepo/proto/helloworld"
 )
 
-type server struct{}
+type server struct{
+	helloworldpb.UnimplementedGreeterServer
+}
 
 func NewServer() *server {
 	return &server{}