The Sims Wiki has recently created some User notifications. These are small templates used on user talk pages to remind users of trivial matters they may have forgotten, neglected or simply, were not aware is needed.
This could be anything from not adding a category to an uploaded image, to forgetting to sign a comment on a talk page or to sign a vote (which makes the vote invalid).
These templates are not warnings or anything official, they're simply friendly reminders, helping you to improve your wiki editing. Unlike a custom created note, these notifications provide links to help pages and describe the issue in greater detail. If you recieve a user notification and have a question, you're always welcome to ask the person who you recieved it from.