I know that some people complain about the lack of documentation with NHibernate. That is something that I never truly could grasp. Leaving aside the excellent book, right there in NHibernate’s site we have a huge amount of documentation.
I’ll admit that the plot in the documentation is weak, but I think that reading this document is essential. It covers just about every aspect of NHibernate, and more importantly, it allows you to understand the design decisions and constraints that were used when building it.
Next time you wonder about NHibernate Documentation, just head over there and check. For that matter, I strongly suggest that you will read the whole thing start-to-finish if you are doing anything with NHibernate. It is an invaluable resource.