Fluent NHibernate - overriding the default foreign key naming conventi

The default foreign key naming convention for FNH is [table name]_id - this is a bit of a wierd one for me as I like the names all my database objects reflect the names of the objects in C# - it keeps things simple as far as mappings go. So - while building the model for isit.gd I decided to find out how you go about overriding the default by adding a custom convention.