diff --git a/README.md b/README.md
index f760a6c..104f686 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ Add the following step to your workflow configuration:
 
 ```yml
 steps:
+    - uses: actions/checkout@v2
     - uses: hadolint/hadolint-action@v1.4.0
       with:
         dockerfile: Dockerfile