Plugin configuration for the whole site not working

[daza1]

Changed the docpad.coffee file to configure for the whole site but no changes made.
Works for each document when specify in metadata, but not with plugin config in docpad.coffee.
Any suggestions?
eg

    plugins:
      sitemap:
        cachetime: 600000
        changefreq: 'monthly'
        priority: 1.0
        filePath: 'sitemap.xml'

[daza1]

Finally found the answer.
If I nest the plugin config under an environment it will work.

environments:
  static:
    plugins:
      sitemap:
        cachetime: 600000
        changefreq: 'monthly'
        priority: 1.0
        filePath: 'sitemap.xml'