For series that have multiple reading orders or that have prequel/sequel/same universe series it would be nice to be able to have those linked on a series' page. For example the Chronicles of Narnia has a publication order and a chronological order, there could be a toggle between the two versions or a link to the alternate reading order. Alternatively Holly Black has multiple series within the same universe and some overlapping characters, the modern faerie tales is a trilogy set in the same world as the folk of the air trilogy which has a sequel series, the stolen heir duology.