Plugin documention with RDoc in Rails 3

I'm writing a Rails 3 plugin and I'm using Engines. I have and app/ folder in my plugin with controller, models and views.

The problem is that when I want to generate documentation with RDoc it won't go into the 开发者_如何学Capp/ folder to parse the files in there. Is there an option I have to pass to it so it will know where to search for them?

I eventually figured it out on my own. I was using the rake task to generate documentation

rake doc:plugins

This runs the rdoc command but it passes the files to be parsed. I eventually got around this by using rdoc directly in my plugin folder like so:

rdoc -o doc/plugins/my_plugin --title "My plugin Docs" --line-numbers --all --main README