The Kindle Store offers e-books in Amazon's proprietary e-book formats: AZW, and, for fourth-generation and later Kindles, AZW3, also called KF8.[23] In August 2015, the "Kindle Format 10" (KFX) file format, which has enhanced typography, was added to the Store.[24] E-books available in KFX are indicated on the e-book's description page.