diff --git a/docs/_sidebar.md b/docs/_sidebar.md
index 48fcdcd..17d2395 100644
--- a/docs/_sidebar.md
+++ b/docs/_sidebar.md
@@ -11,6 +11,7 @@
     - [内网运行的问题](onlinejudge/guide/intranet_problems.md)
     - [代码升级说明](onlinejudge/guide/upgrade.md)
     - [HTTPS相关问题](onlinejudge/guide/https.md)
+    - [使用CDN](onlinejudge/guide/using_cdn.md)
   - [常见问题](onlinejudge/faq.md)
   - [交流群](onlinejudge/guide/qq_group.md)
   - [从旧版迁移](onlinejudge/from_old.md)
diff --git a/docs/onlinejudge/guide/using_cdn.md b/docs/onlinejudge/guide/using_cdn.md
new file mode 100644
index 0000000..58bddeb
--- /dev/null
+++ b/docs/onlinejudge/guide/using_cdn.md
@@ -0,0 +1,9 @@
+# 使用内容分发网络(CDN)
+
+OJ目前仅支持对 Javascript 和 CSS 使用 CDN 加速，即 API 和动态加载的组件依然会从源主机请求，配置很简单，只需修改 OnlineJudgeDeploy 下的 `docker-compose.yml` 文件，将`STATIC_CDN_HOST`设置为自己的 CDN 域名:
+
+```yml
+ - STATIC_CDN_HOST=cdn.oj.com
+```
+
+保存并运行 `docker-compose up -d`即可。
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