diff --git a/README.md b/README.md
index 9df4ae0..e5906ce 100644
--- a/README.md
+++ b/README.md
@@ -239,7 +239,7 @@ When Git 2.18 or higher is not in your PATH, falls back to the REST API to downl
 ```yaml
 - uses: actions/checkout@v3
   with:
-    ref: ${{ github.event.pull_request.head.sha }}
+    ref: ${{ github.event.pull_request.head.sha || github.ref }}
 ```
 
 ## Checkout pull request on closed event