Basing code on JPAContainer tutorial?

I’m new to Vaadin, and am working on a new application using the JPAContainer tutorial as a starting guide.

Given that there are inevitable similarities between my code and the tutorial code, how should I credit the original tutorial code? Is the top-level README file sufficient (along with a copy of the Apache license) or should I mark every file that has anything to do with the original code? Or somewhere in between?

Thanks,


Michel Alexandre Salim