diff --git a/Dockerfile b/Dockerfile
index f5eb08893..c28287cca 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,13 @@
 FROM ruby:2.3.1-alpine
 
+LABEL maintainer="https://github.com/tootsuite/mastodon" \
+      description="A GNU Social-compatible microblogging server"
+
 ENV RAILS_ENV=production \
     NODE_ENV=production
 
+EXPOSE 3000 4000
+
 WORKDIR /mastodon
 
 COPY Gemfile Gemfile.lock package.json yarn.lock /mastodon/
diff --git a/README.md b/README.md
index db60b66f7..9b43e8077 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,8 @@ Consult the example configuration file, `.env.production.sample` for the full li
 
 ## Running with Docker and Docker-Compose
 
+[![](https://images.microbadger.com/badges/version/gargron/mastodon.svg)](https://microbadger.com/images/gargron/mastodon "Get your own version badge on microbadger.com") [![](https://images.microbadger.com/badges/image/gargron/mastodon.svg)](https://microbadger.com/images/gargron/mastodon "Get your own image badge on microbadger.com")
+
 The project now includes a `Dockerfile` and a `docker-compose.yml`. You need to turn `.env.production.sample` into `.env.production` with all the variables set before you can:
 
     docker-compose build