[einhverfr]

Long comments get out of date quickly because it isn't clear how the comments relate to the code on a quick scan. In this case, you want a quick note as to why the code is there. You can add external references if needed.

You don't want to make someone who is editing code stop to think about how it affects the comments.

[tsiki]

>You don't want to make someone who is editing code stop to think about how it affects the comments.

What's the point of comments then if your general rule is that it should be fine to edit code without changing the comments?

[einhverfr]

> What's the point of comments then if your general rule is that it should be fine to edit code without changing the comments?

Not without changing the comments. Without stopping to ponder how two paragraphs of comments fit into the code changes. The comments (aside from API documentation) should annotate the code, not the other way around.