Caitlyn Jenner has undergone an enormous change throughout the past year.
She has gone from being a retired Olympian and "Keeping Up with the Kardashians" dad, to a transgender woman and activist campaigning for civil rights.
According to the New York Times, Jenner is co-authoring the book with Pulitzer Prize-winning journalist, Buss Bissinger.
Bissinger also wrote Jenner's coming out interview for Vanity Fair, where she revealed her new name Caitlyn.
After the much publicized interview with Diane Sawyer, which had 17 million viewers, and the Vanity Fair article, Jenner launched the first season of her reality TV show "I Am Cait."
A book is just the most logical next step for Jenner.
