Need Documentation: How to Extend MD syntax

[PeteMichaud]

I need to add new syntax to my flavor of markdown, but there's no documentation about how to do that, and the code isn't obvious so far. A quick and dirty guide in the readme could help someone like me.

[bhollis]

If you're interested in extending the syntax, I'd look at Kramdown instead of Maruku. Kramdown is well-factored to allow for syntax extensions, and the code is pretty clear.