Thanks for the PR! I would suggest to use the same text as in [application.rb](https://github.com/gitlabhq/gitlabhq/blob/master/config/application.rb#L72) and [gitlab.yml.example](https://github.com/gitlabhq/gitlabhq/blob/master/config/gitlab.yml.example#L22), and also update the latter two files. Specifically, I'd suggest the following text for all three files:
```
# Uncomment and customize the last line to run in a non-root path
# WARNING: This feature is known to work, but unsupported
# Note that three settings need to be changed for this to work.
# 1) In your application.rb file: config.relative_url_root = "/gitlab"
# 2) In your gitlab.yml file: relative_url_root: /gitlab
# 3) In your unicorn.rb: ENV['RAILS_RELATIVE_URL_ROOT'] = "/gitlab"
```
If you agree, could you please update your pull request?