Is there any way to indicate to Hackage that it should not try to generate Haddock documentation? I'm concerned for two use cases for packages using a different docs system:

1) A user might see the commentless auto-generated haddock and believe the package is undocumented.
2) A user might find the haddock through Google, and not realize there's real documentation available elsewhere.

Purposfully causing Hackage's haddock step to fail will mark the package as a "build failure", which gives a bad impression to potential users.