The phrase "new afterword" refers to an extra section added at the end of a book or document, which contains new information or a commentary written by the author after the main content had already been completed. Full definition
Paperback edition with new afterword, «A Tale of Two Barns»: Penguin Putnam, New York, 2000. (gse.harvard.edu)
An enduring masterpiece of investigative journalism by Bryan Burrough and John Helyar, it includes a new afterword by the authors that brings this remarkable story of greed and double - dealings up to date twenty years after the famed deal. (businessinsider.com)
«In this business classic — now with a new Afterword in which the author draws parallels to the recent financial crisis — Roger Lowenstein captures the gripping roller - coaster ride of Long - Term Capital Management. (businessinsider.com)