GHC documentation of modules exposed by the base package

[Andrés Sicard-Ramírez]

Dear all,

By running in GHC 7.10.3

  $ ghc-pkg field base-4.8.2.0 exposed-modules

I can see various modules exposed by base-4.8.2.0 which are not
documented (e.g. GHC.NUm) in

  http://downloads.haskell.org/~ghc/7.10.3/docs/html/libraries/index.html

Which is the criterion for adding GHC documentation to the modules
exposed by base?

All the best,

-- 
Andrés