diff --git a/Dockerfile b/Dockerfile
index bf1868a..db38ef4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,8 +9,9 @@ ENV EMBARK_VERSION=3.1.5 \
 
 # IPFS: 5001 8080
 # Go Ethereum: 30303/tcp 30301/udp 8545
-# Embark: 8000
-EXPOSE 5001 8080 30303/tcp 30301/udp 8545 8000
+# Embark: 8000 8546 8545
+# Swarm: 8500
+EXPOSE 5001 8080 30303/tcp 30301/udp 8545 8546 8000 8500
 
 RUN adduser --disabled-password --shell /bin/bash --gecos "" embark \
     # Install geth
diff --git a/README.md b/README.md
index 1fe0c23..5d4fd2f 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,30 @@
-# embark-docker
\ No newline at end of file
+# Embark for Docker
+
+## Updating versions
+
+* Open `Dockerfile`
+* On the `ENV` directive, update necessary versions.
+
+An exception to this is the NodeJS version, which needs to be updated in the `FROM` directive instead.
+
+## Building
+
+Building requires Docker to be installed on your local machine. To build, run:
+
+```
+$ script/build
+```
+
+## Releasing
+
+Releasing requires that you're authenticated to Docker Hub. To do so, run:
+
+```
+$ docker login
+```
+
+After, or if you're already authenticated, run:
+
+```
+$ script/build --release
+```
diff --git a/script/build b/script/build
new file mode 100755
index 0000000..4a5131b
--- /dev/null
+++ b/script/build
@@ -0,0 +1,73 @@
+#!/usr/bin/env ruby
+require 'json'
+require 'net/http'
+require 'rubygems'
+
+class CLI
+  def run
+    puts 'Building latest' if latest?
+    puts "Tags: #{ tags_for_embark_version.join(', ') }"
+
+    command = ['docker', 'build', '.']
+    tags_for_embark_version.each { |tag| command << "-t=statusim/embark:#{tag}" }
+
+    system(command.join(' '))
+
+    push_to_registry if ARGV.include?('--release')
+  end
+
+  private
+
+  def push_to_registry
+    tags_for_embark_version.each do |tag|
+      command = ['docker', 'push', "statusim/embark:#{tag}"]
+      system(command.join(' '))
+    end
+  end
+
+  def embark_versions
+    embark_versions ||= begin
+                          package_info['time'].keys.map do |v|
+                            Gem::Version.new(v) rescue nil
+                          end.compact.select { |v| v < Gem::Version.new('7.0.0') }
+                        end
+  end
+
+  def package_info
+    package_info ||= begin
+                       json = Net::HTTP.get('registry.npmjs.org', '/embark')
+                       JSON.parse(json)
+                     end
+  end
+
+
+  def embark_version
+    embark_version ||= begin
+                         dockerfile_path = File.expand_path('../../Dockerfile', __FILE__)
+                         dockerfile = File.open(dockerfile_path, 'r').read
+                         Gem::Version.new(dockerfile.match(/EMBARK_VERSION=([0-9.]*)/)[1])
+                       end
+  end
+
+  def latest?
+    package_info['dist-tags']['latest'] == embark_version.to_s
+  end
+
+  def tags_for_embark_version
+    tags = []
+    tags << 'latest' if latest?
+    tags << embark_version
+
+    # Version being X.Y.Z, figure out if we're the largest X.Y
+    same_minor_versions = embark_versions.select { |ev| ev.segments[0..1] == embark_version.segments[0..1] }.sort
+    tags << embark_version.segments[0..1].join('.') if embark_version == same_minor_versions.last
+
+    # Version being X.Y.Z, figure out if we're the latest X
+    same_major_versions = embark_versions.select { |ev| ev.segments[0] == embark_version.segments[0] }.sort
+    tags << embark_version.segments[0].to_s if embark_version == same_major_versions.last
+
+    tags
+  end
+end
+
+CLI.new.run