I was informed after a deleted comment that a moderator cleaned up the comment section. As comments can (and should for certain circumstances) be cleaned up could we add a message for the comment section:
which is pointing to the comments link as shown.
It avoids the surprise and anger for newbies if comments mysteriously vanish, and with the link people understand that it is allowed and even required without any personal attack involved.
COUNTERARGUMENTS TO THE GIVEN RESPONSES:
"Many mods are good about posting a message manually". Some are not. And as mods are humans, they are prone to forget it. Worse, some cannot even be sure if, when and why they have removed a comment, especially after a prolonged time. In fact this is the exact reason because in the case which triggered the feature request the mod unwillingly modified the wrong comment.
"Comments are meant to be temporary, so no one should be too surprised if they vanish." But people are surprised and angered simply because noone looked up how comments work in Stackoverflow. They should look up ? Sorry, how many duplicate questions over crystal clear answers occur every day in meta ?
"Not every comment deletion warrants notification". This notification has a very conspicous advantage: You can be sure that the comment section is in the original state if the message is missing and you can also be sure that the comment section has been modified if the message occurs. You have NO idea what is the state currently because noone can look in the head of the moderator. Did he modified it or not ? Is this strange answer a answer to a question or a now missing comment ? Moreover, it has pretty advantages for the mod, too: He can see at a glance if someone already cleaned up a comment thread.
When a 20-comment messy argument gets cleaned up a mod will often add a new comment saying "Comments deleted; take it to chat" or some such.
So he adds instead "Cleaned up; take it to chat". It's shorter, convey the same message and is therefore preferable. So what is your argument ?
At the other extreme, if somebody adds a comment saying "your link is broken; try this (URL here)", the author responds "thanks, fixed it", and somebody then deletes those comments, there is no point in saying anything more, and a "comments deleted" notice would just make people wonder what happened.
So you are aware that "people may wonder what happened" because you are using it as argument against the notice, but the very same notice that could prevent the worse case, angry and surprised people, is not accepted as argument by you ? In fact, if the mod cleans up, he can add something like, "Link was fixed" to the message so everyone knows.
