diff --git a/docs/index.md b/docs/index.md
index ff86838..1100aef 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -19,6 +19,9 @@ hero:
     - theme: alt
       text: 订阅规则
       link: /subscription/
+    - theme: alt
+      text: API
+      link: /api/
     - theme: alt
       text: 疑难解答
       link: /faq/
diff --git a/docs/subscription/index.md b/docs/subscription/index.md
index 0222f62..a3a5c13 100644
--- a/docs/subscription/index.md
+++ b/docs/subscription/index.md
@@ -1,5 +1,30 @@
-# 订阅规则
+# 订阅规则 {#title}
 
 GKD 的本地规则和远程规则都是订阅, 它们的格式完全一致, 不同之处在于本地订阅用户可以自行更改, 远程规则需要自动更新
 
+订阅使用 [JSON5](https://json5.org/) 语法, 如下便是一个最简单的没有规则的订阅文件的内容
+
+```json5
+{
+  id: 233,
+  name: 'Subscription',
+  version: 0,
+  author: 'author',
+  updateUrl: 'https://gist.github.com/lisonge/3f5693182ad4ef5e307be760dba22bcb/raw/gkd.json5',
+  checkUpdateUrl: 'https://gist.github.com/lisonge/3f5693182ad4ef5e307be760dba22bcb/raw/gkd.json5',
+  supportUri: 'https://gkd.li/',
+  categories: [],
+  globalGroups: [],
+  apps: [],
+}
+```
+
+同时你也可以通过下面的链接来添加它
+
+```txt
+https://gist.github.com/lisonge/3f5693182ad4ef5e307be760dba22bcb/raw/gkd.json5
+```
+
+上面配置的各项字段的说明注释可在 [API](/api/interfaces/RawSubscription) 查看
+
 TODO