From the link, about comments:

  Use as explanation of intent.
  Use as clarification of code.
  Use as warning of consequences.

Here's a link to a well-known recent book, half of which is pretty much about why those points are a real and frequent thing, and why code should be much more thoroughly commented than it's recommended by the usual philosophies.

https://www.amazon.com/Philosophy-Software-Design-John-Ouste...