fwiw.
Program = Doc + Code
Doc = Reference/User Manuals + Source Comments + Where used docs
Code = Source Code + Test code
I wont sign/close a project if any of the above evals to zero 
But that is just me.
In general, if something isn't documented, then it isn't supported; and it's
a code that needs to be look into.
Programmers come and go... but the code sits on my box and my as* is on the
line :-))
Again, that is just me.
kind regards -botp