On this answer, there is the following comment:
But there is no username associated with it, nor is there any option to vote on or flag it. I've been a member on Stack Exchange for a while, but I've never seen anything like this before. My guess is that this is some type of moderator comment. I'd like to know what this is and, if possible, some information about where this feature came from (i.e. a Meta post or Blog post describing the need for it).