Downvoting is not only a privilege, but also a responsibility for both of the sides. For the author of the post to improve the post based on the received feedback, and for the user who cast the downvote to review those changes and alter the vote if the changes are satisfying. However, it is quite difficult to track the edits to the posts and keep on checking them all the time.
In order to make it easier to find those posts that were improved and to remind the downvoters to review the post after edits, we have added a notification for users who downvoted the post to come back to it and review the changes. A notification is sent each time a post is updated, as long as the downvote is set on the post.
A notification looks like below.
Please let us know if you have any questions or comments!