Be straight with him. That you both need to work on your communication back and forth and you'd like it if he could use more comments in his code. Tell him the

Be straight with him. That you both need to work on your communication back and forth and you'd like it if he could use more comments in his code. Tell him the time writing a comment saves you ten-fold on stopping to 'follow the program'. Ask him if he's been having trouble with any of your comments. (Communication takes two people, errors happen between BOTH people.) Coding practices, try and work on him with it...don't be direct but use a 'hey, I know a way you might like to do this instead, let me show you' type approach. It will take a lot of time to break bad-habits. I started programming not using Camel notation, instead preferring title case...I still prefer Title Case after years of trying to break myself :)