diff --git a/docs/README.md b/docs/README.md
index b1fc129..4a0b6c9 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -398,6 +398,8 @@ Cookies
 
 **必选参数 :** `id` : 音乐 id
 
+**可选参数 :** `br`: 码率,默认设置了999000即最大码率,如果要 320k 则可设置为 320000,其他类推
+
 **接口地址 :** `/music/url`
 
 **调用例子 :** `/music/url?id=33894312` `/music/url?id=405998841,33894312`