How to create recipe with 2 source tar files

[lfur...@mz.com]

How would I add https://nodejs.org/dist/v4.5.0/node-v4.5.0-linux-x64.tar.xz as a second source file if I wanted to bundle it on the same rpm as statsd ? Assuming I have the recipe below:

class Statsd < FPM::Cookery::Recipe

  description 'Daemon for easy but powerful stats aggregation'

  name     'statsd'

  version  '0.8.0'

  revision 1

  homepage 'https://github.com/etsy/statsd'

  source   "https://github.com/etsy/statsd/archive/v0.8.0.tar.gz"

  md5      'e2f8ca60fad21301e3f4f9b92ff862e8'

  arch     'noarch'

  section  'databases'

  def build

  end

  def install

    opt("statsd").install Dir['bin', 'lib', 'utils', 'docs', 'backends', 'LICENSE', 'NOTICE', 'servers', '*.js']

  end

end