diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..c0f6aa6
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1 @@
+FROM node:16-bullseye
diff --git a/README.md b/README.md
index cebf3b8..d4d475c 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,5 @@
 # runner-images
 
+This is the default image used by [act_runner](https://gitea.com/gitea/act_runner) to run workflows.
+
+If the tool you need does not exist in this image, please create an [issue](https://gitea.com/actions/runner-images/issues) to report it or send a [pull request](https://gitea.com/actions/runner-images/pulls) to add it.