Board Thread:News and Announcements/@comment-126761-20150625165159/@comment-126761-20150626145142

In terms of scope on Marvel DB, that sounds about right.

Different communities uses notice boxes in different ways - on Wookieepedia for example, the "Canon/Legends" headers would also come under this feature. "This page contains spoilers", "this page concerns content from [game sequel]", and "this page needs cleanup" are other kinds of templates that would often come under this feature. Essentially, it's about the notices at the top of an article that aren't an intrinsic part of the article itself.