diff --git a/README.md b/README.md
index 69d7f83..1d53aa0 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@ $config = [
     'ssl_key'        => '',
     'ssl_cer'        => '',
     // 缓存目录配置（可选，需拥有读写权限）
+    'cache_path'     => '',
 ];
 ```
 3.1 实例指定接口