Cabal or haddock? Can't export documentation from hidden module

Hi, I opened this ticket, but then I thought that maybe it is not related to haddock but to how Distribution modules call haddock: http://trac.haskell.org/haddock/ticket/107 What do you think? When I don't expose a module in .cabal file, other modules do not show documentation imported from that module. Thanks, Maurício