Mark,
If there is another printing incorporate the changes. Offer a supplement to anyone tha wants one for x dollars.
DICKL
+1
Subsequent printings could be dubbed "2nd Edition" to distinguish it from the 1st. 
Yeah....that part will cost me! I have to revise the cover for that, but it's the only way I can think of to externally distinguish it from the first version. I think I will avoid the expensive Euro edition, which ended up costing me more than the number of copies it sold, minus $200-something until today! Most Euro buyers got the hardcover edition, and I think that since 96% of all sales to date are in that cover that I will just skip a redesign of the paperback full-volume version. I got almost 40% complaints about the thick paperback losing pages after the spine was cracked, likely from folding the book open at a page, so I don't want to do that again. Most paperbacks are like that, but I understand why they are popular: they cost (in this case) $12 less to make, per-copy. I finally 'broke even' on the paperback sales in early 2017.
The Supplement will be paperback, though: the hardcover Bible-style backing is only available over 80-some pages long, and it won't be nearly that big. From all I have heard, it had better be in full color, though!