Khloé Kardashian and Lamar Odom may no longer be married, but that doesn’t mean that they aren’t on good terms. Odom is busy promoting his new book, Darkness to Light, reliving his troubled four-year marriage to Kardashian and struggles with addiction. In the book, Odom discusses that he had cheated on Kardashian throughout their marriage and that he tried to keep his drug addiction a secret from her.

Despite this, Kardashian is happy for his new success. In an Instagram post on Friday, Odom shared that his memoir had made it to the New York Times’s bestsellers list.

“Wow don’t know where to begin. We did this! We made @nytimes best sellers list for my first book, Darkness To Light! What felt like a lifetime of writing and working on this project finally came to Light and I am grateful to YOU ALL!” he wrote. “Your continued support and love is appreciated! It took a lot of courage for me to get so raw and candid with you all but I wanted you guys to get MY true story!”

He also specifically thanked Kardashian in his caption, writing, “I want to thank the best kids in the world @iamdestinyodom and Lamar Jr. ya’ll are my rock. Thanks for sticking with me during my hardest times. My true fans, my friends and family love ya’ll, @khloekardashian, @benbellabooks and my entire publishing team, my co-author Chris Palmer and last but not least the best publicist in the world @evesarkisyan for always doing your thing.”

Kardashian commented on the post, congratulating her ex-husband on the feat.

“Look at God!!! Congratulations Lammy! Keep shining,” she wrote. Odom’s ex-sister-in-law Kim Kardashian also liked the photo.

Odom has been open about the regrets in his marriage to Kardashian in recent interviews, adding that he hopes they’re able to reconcile in the future.

“I wish I could have been more of a man,” he told People. “It still bothers me to this day. But regret is something we have to learn to live with.”