diff --git a/README.md b/README.md
index c7c4163..9b0f747 100644
--- a/README.md
+++ b/README.md
@@ -405,7 +405,7 @@ jobs:
 - name: Lint Markdown
   uses: johndoe/some-action@v1
   with:
-    files: ${{ steps.filter.changed_files }}
+    files: ${{ steps.filter.outputs.changed_files }}
 ```
 </details>