diff --git a/content/actions/creating-actions/metadata-syntax-for-github-actions.md b/content/actions/creating-actions/metadata-syntax-for-github-actions.md
index 85cba6f30a9b..1052bd4b7655 100644
--- a/content/actions/creating-actions/metadata-syntax-for-github-actions.md
+++ b/content/actions/creating-actions/metadata-syntax-for-github-actions.md
@@ -299,7 +299,7 @@ runs:
 
 #### `runs.image`
 
-**Required** The Docker image to use as the container to run the action. The value can be the Docker base image name, a local `Dockerfile` in your repository, or a public image in Docker Hub or another registry. To reference a `Dockerfile` local to your repository, use a path relative to your action metadata file. The `docker` application will execute this file.
+**Required** The Docker image to use as the container to run the action. The value can be the Docker base image name, a local `Dockerfile` in your repository, or a public image in Docker Hub or another registry. To reference a `Dockerfile` local to your repository, the file must be named `Dockerfile` and you must use a path relative to your action metadata file. The `docker` application will execute this file.
 
 #### `runs.env`