diff --git a/README.md b/README.md
index 67d3a58..4e22b5c 100644
--- a/README.md
+++ b/README.md
@@ -55,4 +55,5 @@ jobs:
 
             This PR is auto generated by [depup workflow](https://github.com/${{ github.repository }}/actions?query=workflow%3Adepup).
           branch: depup/reviewdog
+          base: master
 ```