      }, {
       names: ['links', 'l']
       type: 'arrayOfString'
-      help: 'External links'
+      help: 'External links in format `docker-host[:as-host]`'
       default: []
      }, {
       names: ['compose', 'c']

writeProjectEnv = () =>

  for link in options.links
    if link.match /redis/
      environment.REDIS_URI = "redis://#{link}:6379"
      environment.REDIS_HOST = link
      environment.REDIS_PORT = 6379
    if link.match /mongo/
      environment.MONGODB_URI = "mongodb://#{link}/db"

  readEnv "#{options.stack_env}/#{templateData.projectName}/env", writeData


     }, {
      names: ['environment', 'e']
      type: 'arrayOfString'
      help: 'Environment `key=value` pairs'
      default: []
     }, {
      names: ['no-defaults', 'n']
