diff --git a/README.md b/README.md
index dadb65d..660fc54 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ jobs:
       - name: Run chart-testing (list-changed)
         id: list-changed
         run: |
-          changed=$(ct list-changed)
+          changed=$(ct list-changed --targer-branch main)
           if [[ -n "$changed" ]]; then
             echo "::set-output name=changed::true"
           fi