diff --git a/SUMMARY.md b/SUMMARY.md
index eabd38f..e2e1ac5 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -45,8 +45,9 @@
    * [5.3. Middleware中间件](ch5-web/ch5-03-middleware.md)
    * [5.4. Validator请求校验](ch5-web/ch5-04-validator.md)
    * [5.5. Database和数据库打交道](ch5-web/ch5-05-database.md)
-   * [5.8. Layout大型web项目分层](ch5-web/ch5-08-layout-of-web-project.md)
-   * [5.12. Load-balance负载均衡](ch5-web/ch5-12-load-balance.md)
+   * [5.7. Layout大型web项目分层](ch5-web/ch5-07-layout-of-web-project.md)
+   * [5.9. 灰度发布和 A/B test](ch5-web/ch5-09-gated-launch.md)
+   * [5.11. Load-balance负载均衡](ch5-web/ch5-11-load-balance.md)
 * [第六章 分布式系统](ch6-cloud/readme.md)
    * [6.1. 云上地鼠(TODO)](ch6-cloud/ch6-01-cloud.md)
    * [6.2. Raft协议(TODO)](ch6-cloud/ch6-02-raft.md)