Hello Jake, Are you asking about the internal implemenation of packages? In that case, it's not too surprising that the User's Manual doesn't say much about: that's a very internal feature, under the abstraction barrier, that the majority of Haskellers should not have to know or worry about. You will probably have to consult the source code and internal documentation to find out more about that. As a result, the user guide focuses on the two operations that most people will do with packages: creating them and installing them. Perhaps you are having difficulty figuring out how to create a package? One thing that the user guide does take as an assumption is that you know how to setup a non-Cabalized source directory and build packages directly with GHC. Such a modification might be a useful addition to the manual (patches accepted!) If you can give some more details, we might be able to help better. Cheers, Edward