I am looking at ESB (Programmer's Elbow) from "Brewing Classic Styles". It lists 2oz hops for 60min and 1oz for 0min. There is no further explanation about "0min", and in the related podcast, there is no mention that I could find of the 1oz. I would appreciate some advice. Is it likely an error, or should I dry hop that 1oz in secondary, or something else?