this feature of Github is very useful for quickly writing documentation.
Relative links in markup files
via The GitHub Blog by ymendel on 1/30/13
We show rendered markup in several places on GitHub, most notably
including a project's main README on the Repository page itself.
Starting today, GitHub supports relative links in markup files. Now
you can link directly between different documentation files, whether
you view the documentation on GitHub itself, or locally, using a
different markup renderer.
You want examples of link definitions and how they work? Here's some
Markdown for you. Instead of an absolute link:
…you can use a relative link:
[a relative link](other_file.md)
and we'll make sure it gets linked to user/repo/blob/branch/other_file.md.
If you were using a workaround like [a workaround
link](repo/blob/master/other_file.md), you'll have to update your
documentation to use the new syntax.
This also means your documentation can now easily stand on its own,
without always pointing to GitHub.
If you want more information, we have a help article for you. Happy documenting!