diff --git a/.gitignore b/.gitignore
index 37d7e73..0c3802f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 node_modules
 .env
+Dockerfile
+docker-compose.yml
diff --git a/app.json b/app.json
index 8810ba2..586c5f7 100644
--- a/app.json
+++ b/app.json
@@ -3,5 +3,6 @@
   "description": "A barebones Node.js app using Express 4",
   "repository": "https://github.com/heroku/node-js-getting-started",
   "logo": "http://node-js-sample.herokuapp.com/node.svg",
-  "keywords": ["node", "express", "static"]
+  "keywords": ["node", "express", "static"],
+  "image": "heroku/node"
 }