The hardest part about this question is that “code documentation” is a very vague concept. Are we talking about an API document for programmers who are using t

The hardest part about this question is that “code documentation” is a very vague concept. Are we talking about an API document for programmers who are using the code, calling its functions? Are we talking documentation for users of the application that this code implements? Are we talking about documentation for someone who will be maintaining the code? Some other type of documentation? What problem are you really trying to solve with this documentation? Once you answer that question then you can start to figure out the best way to document it.