Missing Configuration in unicorn.rb?

According to [gitlab.yml](https://github.com/gitlabhq/gitlabhq/blob/6-0-stable/config/gitlab.yml.example#L22-L27) I should edit ```unicorn.rb``` with the following setting.

```ENV['RAILS_RELATIVE_URL_ROOT'``` however it does not exist anywhere in the [file](https://github.com/gitlabhq/gitlabhq/blob/6-0-stable/config/unicorn.rb.example)

Does this need to be set somewhere, or should it be removed from the directions in gitlab.yml?