There’s nothing limiting what a comment should be as far as I know.
As an example of what I mean, I’ve seen in a 10k+ lines python code a few lines of bit manipulation. There was a comment explaining what those lines did and why. They didn’t expect everyone to be proficient in bit manipulation but it made it so that anyone could understand anyway.
I say ess cue ell for the sake of uniformity because it’s not Mysequel nor Postgresequel and the language changed from Sequel to the acronym SQL in the 70s so not really in the “too new” ballpark anymore.