message: document autogenerated route prefixes
diff: @@ -145,6 +145,22 @@ This allows you to define the behavior of the automatic creates routes \(NOT the
  * `Redirect` will redirect any HTTP requests to HTTPS.
  * `None` will mean a route for HTTP will _not_ be created, and no redirect.
  +### `routes.autogenerate.prefixes`
  +
  +This allows you to define an array of prefixes to be prepended to the autogenerated routes of each environment. This is useful for things like language prefix domains, or a multi-domain site using the Drupal `domain` module. For each
  +
  +NOTE: This is only available for projects which deploy to a Kubernetes cluster.
  +
  +```
  +routes:
  + autogenerate:
  + prefixes:
  + - www
  + - de
  + - fr
  + - it
  +```
  +
  ## Environments
  Environment names match your deployed branches or pull requests. This allows for each environment to have a different config. In our example it will apply to the `master` and `staging` environment.
  