diff --git a/book/v3/controllers/README.md b/book/v3/controllers/README.md
index ac73673..0b5b236 100644
--- a/book/v3/controllers/README.md
+++ b/book/v3/controllers/README.md
@@ -2,6 +2,7 @@
 
 业务处理
 
+![](./biz.png)
 
 ## 单元测试 (TDD)
 
diff --git a/book/v3/controllers/biz.png b/book/v3/controllers/biz.png
new file mode 100644
index 0000000..c9d0074
Binary files /dev/null and b/book/v3/controllers/biz.png differ