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+++ b/README.md
@@ -1,4 +1,18 @@
 # mirai-console-jcr-plugin
 ## J Cpp Reference Plugin
-https://en.cppreference.com/w/
 
+在QQ群内搜索 [CppReference](https://en.cppreference.com/w/) 的文档
+
+# 用法
+```shell
+# 消息检测
+c <keyword>   # 搜索C文档
+cpp <keyword> # 搜索CPP文档
+
+# 控制台命令
+/jcr update   # 更新CPP索引
+```
+
+# 索引来源
+c 索引来自官网离线文档，手动解析生成
+cpp 索引来自 https://github.com/Guyutongxue/cppreference-index 感谢 @Guyutongxue
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