Rails 3 + Different ORM

I'm migrating an old project (not Rails) over to Rails 3. I've been
using Sequel as my ORM and I'm quite happy with it. However, when I
add Sequel models to my app/model directory, they don't seem to load
on their own. Am I going to need to load them manually or do I need to
set some kind of configuration option somewhere?

Well, ignore that.

Rails does autoloading quite a bit differently that I expected and it
appears my stuff is getting loaded. *grimace*