They wrote

Feel free to fork the project under a

(yes, the sentence ends with the 'a')

The ZUDoom GitHub project description says

UZDoom is a feature centric port for all Doom engine games, based on ZDoom, adding an advanced renderer, powerful scripting capabilities, and forked under a

It ending with 'forked under a' is probably a reference to that comment? lol, nice reference joke, but I hope they change it after a while, because as a description it's quite confusing.

Great comment on there links two code comment threads I found significant and interesting.

While it was primarily about ethics, it should also be noted that the code was described as being "impressively wrong", as well as not actually compiling. I mean, it basically checked if a theme was dark by if it had the word "dark" in the name - which is not a good heuristic - when better ways of doing it exist.