If you host your website, blog or project pages in [GitHub Pages](https://pages.github.com/), you might already be rolling your own [custom domain](https://help.github.com/articles/setting-up-a-custom-domain-with-github-pages/). However, while there is plenty of information on how to set that up, what you might not know is that you can also set up a custom subdomain for your project pages.
