You can either create a second series which is numbered the other order, explaining and linking the two series in their descriptions, or you can just put the recommendation in text in the description of the main series.
Thank you, Cait. I missed this when you posted, and, occasionally being a bit scatter-brained, am just now coming back to see what I can do. I think I'll create the alternate series and link the two in the description.
http://www.goodreads.com/series/40441...
Zola himself recommended a different reading order.
http://en.wikipedia.org/wiki/Les_Roug...
What is the policy on this?