[krbo]

From a Brandon Sanderson's web about Elantris Tenth Anniversary Edition:

The ebook will update to this text, and if you’ve purchased Elantris in ebook you will get the tenth anniversary edition for free. On some ebook platforms like iBooks the update should happen automatically, and on other platforms like Kindle you have to email customer support and ask them to update your file. If—for some reason—you want to preserve the old text, you might want to make a backup of the file. (Tor books are DRM-free, so you should be able to do this.)