diff --git a/README.md b/README.md
index 8fe140f..5120d87 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ When Git 2.18 or higher is not in your PATH, falls back to the REST API to downl
     # The branch, tag or SHA to checkout. When checking out the repository that
     # triggered a workflow, this defaults to the reference or SHA for that event.
     # Otherwise, uses the default branch.
+    # Default: ${{ github.ref }}
     ref: ''
 
     # Personal access token (PAT) used to fetch the repository. The PAT is configured