That's a shame, you hear this a lot about lisp code and I think the problem is that the people who really grok lisp and write 'genius' code can be a bit blase about documenting their code.

Simple documentation for standard function definitions is fine but macros definitely need special attention. Some say macros are over-used but I think it's more of a case they're under-documented. Even if the name of the macro gives you a fair idea, documenting how it works and what is generates with examples goes a long way to deciphering them for maintenance. cheers.