diff --git a/notes/helloshop/ordering-service-cqrs-query.md b/notes/helloshop/ordering-service-cqrs-query.md
index 95bd62b..5441d7b 100644
--- a/notes/helloshop/ordering-service-cqrs-query.md
+++ b/notes/helloshop/ordering-service-cqrs-query.md
@@ -4,6 +4,8 @@
 
 https://learn.microsoft.com/zh-cn/azure/architecture/patterns/cqrs
 
+https://www.xcode.me/Training/UnitNote/576
+
 ### 定义订单查询接口
 
 ```csharp