I suppose the warning can be kept on since he did not explain his revert but as mentioned above he removed a bad faith addition made by a clever vandal It was said above by Jer757 The information isn t questionable its pure vandalism by someone who is smarter than your average vandal With that being said his edit was actually in good faith even though he did not explain his removal of content It is advisable to always explain removals as often times content is removed maliciously but again in this case based on the information which I have now the removal was done for a legitimate reason Thanks