diff --git a/SUMMARY.md b/SUMMARY.md
index ff4c39a..195638d 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -50,18 +50,18 @@
    * [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)
 * [第六章 分布式系统(TODO)](ch6-cloud/readme.md)
-   * [6.1. 云上地鼠](ch6-cloud/ch6-01-cloud.md)
-   * [6.2. Raft协议](ch6-cloud/ch6-02-raft.md)
-   * [6.3. 分布式哈希](ch6-cloud/ch6-03-hash.md)
-   * [6.4. 分布式队列](ch6-cloud/ch6-04-queue.md)
-   * [6.5. 分布式缓存](ch6-cloud/ch6-05-cache.md)
-   * [6.6. etcd](ch6-cloud/ch6-06-etcd.md)
-   * [6.7. confd](ch6-cloud/ch6-07-confd.md)
-   * [6.8. 分布式锁](ch6-cloud/ch6-08-lock.md)
-   * [6.9. 分布式任务调度系统](ch6-cloud/ch6-09-sched.md)
-   * [6.10. 延时任务系统](ch6-cloud/ch6-10-delay-job.md)
-   * [6.11. Kubernetes](ch6-cloud/ch6-11-k8s.md)
-   * [6.12. 补充说明](ch6-cloud/ch6-12-faq.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)
+   * [6.3. 分布式哈希(TODO)](ch6-cloud/ch6-03-hash.md)
+   * [6.4. 分布式队列(TODO)](ch6-cloud/ch6-04-queue.md)
+   * [6.5. 分布式缓存(TODO)](ch6-cloud/ch6-05-cache.md)
+   * [6.6. etcd(TODO)](ch6-cloud/ch6-06-etcd.md)
+   * [6.7. confd(TODO)](ch6-cloud/ch6-07-confd.md)
+   * [6.8. 分布式锁(TODO)](ch6-cloud/ch6-08-lock.md)
+   * [6.9. 分布式任务调度系统(TODO)](ch6-cloud/ch6-09-sched.md)
+   * [6.10. 延时任务系统(TODO)](ch6-cloud/ch6-10-delay-job.md)
+   * [6.11. Kubernetes(TODO)](ch6-cloud/ch6-11-k8s.md)
+   * [6.12. 补充说明(TODO)](ch6-cloud/ch6-12-faq.md)
 * [第七章 Go和ast(TODO)](ch7-ast/readme.md)
 * [第八章 Go和那些生产力工具(TODO)](ch8-tools/readme.md)
 * [附录](appendix/readme.md)