Excluding a uri from Codeigniter handling it?

[eluser]behdesign[/eluser]
I've installed Wordpress to the /blog subdirectory of my web project that otherwise uses Codeigniter. How do I configure CI to ignore requests to the Wordpress directory so I can finish installation and use the admin interface. Eventually, I'll AJAX the content from the blog into the pages in CI, so keeping the content in the same domain is important.

Thanks!