diff --git a/serve-github-pages.rb b/serve-github-pages.rb
new file mode 100644
index 0000000..03e1903
--- /dev/null
+++ b/serve-github-pages.rb
@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+
+# Preview the rendered GitHub Pages in a browser.
+# Inspired by http://asciidoctor.org/docs/user-manual/#external-preview
+
+# Utilities to replace common UNIX commands in Makefiles etc
+# https://github.com/ruby/ruby/blob/trunk/lib/un.rb
+require 'un'
+
+# Pass these values as command line arguments to httpd.
+ARGV.replace [File.expand_path('.', __dir__), '--port=8080']
+
+# Start the http server.
+httpd