[usr1106]

At least he should give credit to the original author.

Not aware there would be a standardized header for that, but you can always invent your own ones.

   Original-idea-from: a b <[e-mail]>

[ptx]

There is "Co-authored-by" which is supported on GitHub [1] and seems appropriate if the maintainer is basing the solution on someone's code.

[1] https://github.blog/2018-01-29-commit-together-with-co-autho...