In her upcoming memoir, The Secrets of My Life, Caitlyn Jenner confirms that she underwent gender confirmation surgery in January.

“The surgery was a success, and I feel not only wonderful but liberated,” she wrote, according to excerpts first reported by Radar. "I am telling you because I believe in candor—So all of you can stop staring. You want to know, so now you know. Which is why this is the first time, and the last time, I will ever speak of it.”

Jenner, 67, writes that she had some reservations about having the procedure, mostly because of health concerns.

“So why even consider it? Because it’s just a penis," she explains. "It has no special gifts or use for me other than what I have said before, the ability to take a whiz in the woods. I just want to have all the right parts. I am also tired of tucking the damn thing in all the time.”

What, if any, procedures a transgender person may undergo is influenced by a number of factors, including personal choice, health and cost. According to the National Center for Transgender Equality, only 12% of trans women in the United State undergo vaginoplasty.

Jenner's memoir, The Secrets of My Life, is in stores on April 25. On April 21, she will sit down for another interview with Diane Sawyer, two years after her groundbreaking interview with the journalist.