diff --git a/README.md b/README.md
index 88b4079..7c5c4ec 100644
--- a/README.md
+++ b/README.md
@@ -7,4 +7,6 @@ Add this step into workflow
       uses: stCarolas/setup-maven@v5
       with:
         maven-version: 3.8.2
+        # download mirror,url or aliyun or empty
+        maven-mirror: '' 
 ```