" 
 :Nat, nothing in Bill's  or summary indicates he did not assume good faith. It's a good idea to glance at a user's contributions before putting a ""Welcome to Wikipedia"" template on his or her talk page with beginner-level guidance on it tantamount to a reprimand, otherwise you risk appearing to assume bad faith yourself. As for an explanation of the edit, the AHD entry for comprisehas an interesting usage note that applies here.   "