It would be nice for Logos to provide this to people, like me, who invested in the complete series. However, they clearly list the volumes included. At the time that I bought the series, about a month ago, 1 Corinthians wasn't released yet, and therefore wasn't included in the volumes that I purchased. I'm guessing that is what happened to the person who doesn't have Revelation, either. We didn't purchase a license to every American Commentary Series book that will ever be released. We bought the series as it was currently constituted on Logos. I'm sure that the overall price of the series will increase with the addition of this book. Perhaps, Logos would be willing to only charge us that difference in prices, rather than the full $20. If not, I don't begrudge the authors and the company the right to make money off the work that they did. I for one am thankful for the work that they have done. 1 Timothy 5:18 "For the Scripture says, 'Do not muzzle the ox while it is treading out the grain,' and 'The worker deserves his wages.'" As a Christian, I won't quibble over a few dollars, when the benefit to me is the unfolding of the Word.