A customer (from a freelancer website, who awarded me this single project) has asked me to add some extra functionality to a
Wordpress plugin which is licensed under "GPL version 2", the customer explicitly mentioned this plugin's name and asked me to either add the extra functionality to it, or code the whole thing from scratch.
I decided to edit the plugin since it's allowed under GPL v2
(I think, please let me know if I'm wrong) but I'm not sure how I should provide it to customer after it's edited...
I mean, based on my understanding after reading GPL v2 , I should include something like the following text above all the files that I edit, right?
This file was modified on Jan 12, 2020 to add extra functionality to the original XYZ plugin
And then I provide it with the same name as the original plugin to customer? nothing else required?