Dear Cafe, it seems that haddock (as used on hackage) does not link to identifiers from other packages (neither in HTML nor in hyperlinked source). This hurts, especially if a project has several packages that are meant to be used together, but are split for others reasons (modularity, maintenance). Example: This index has an entry for "bpf", with a non-linked module name Csound.Base: https://hackage.haskell.org/package/csound-expression-5.3.2/docs/doc-index-B... The reason is (I think) that "bpf" is defined elsewhere, but re-exported, and "elsewhere" is in a different package. It is very hard to find the name of this package! (in this case, csound-expression-opcodes) Of course, in no way is this a complaint about Anton's csound-* project. I use it in teaching, and I wonder how could we make documentation more accessible - without extra manual work. Now, :doc of ghc-8.6 works, and :info helps somewhat: :info bpf ... -- Defined in ‘Csound.Typed.Opcode.SignalGenerators’ but it still does not show the name of the package. But at least we know the name of the module to look for. - J.W.