When will bors auto-generate co-author information?

Stream: mathlib4

[Wen Yang]

I am sorry that the merge of #7273 didn't mention @Winston Yin (尹維晨) and @Johan Commelin .
Lately I thought that the bors auto-generated co-author information, but it did not work this time.

[Wen Yang]

Perhaps the bors only check who commits the code and do not check the co-author information in the commit message?

[Wen Yang]

For example, Winston Yin suggested some changes and then I accepted them, so I was the one who committed the code, and the bors did not add him to the commit message when the PR was merged into the master branch.​

[Johan Commelin]

@Wen Yang I don't personally care about the co-author information. So don't sweat about it.