Looking for a code book to log my comments, code snippets, etc.

Hello, I'm looking for an app that will allow me to write some sort of log that can contain code snippets, explanations, comments. That will keep it all organized and has code syntax.

Basically I'm tasked to break down a lot of code from VB6. I want a place I can add my code snippets for sql, maybe pseudo code and anything else I might need to add.

Maybe break the log up into potential function names.

Thanks for the help.