There is no conceivable reason addition should exist. Barely anyone uses it, it doesn't have any followers, and really what kind of useful information could the tag "addition" possibly convey?
closed as off-topic by Martijn Pieters, Aziz Shaikh, Shadow Wizard, CRABOLO, nicael Sep 29 '14 at 17:11
This question appears to be off-topic. The users who voted to close gave this specific reason: