To amplify the bullet from here:
Stop using the "Edit:" syntax of forums. We have explicit revision histories on everything, so everything should read as if the best version was the first version. if you see Edit: X hanging around, edit it out to make the content flow more smoothly.
Specifically, we have a revision history. We have a great revision history. Signalling edits is for sites that don't have a revision history. Make your edits flow cleanly in your original post, such that a first time visitor who reads it (the majority of our traffic) doesn't have to apply errata to a post.
Sometimes, Nota Bene (N.B.) instructions to answerers are necessary in a question. But "Addendum" is just a longer word for "edit." At the end of the day, just tacking text onto the bottom of the post is a lazy excuse for not improving a post.