Kanye West says he was diagnosed with a mental condition when he was 39 years old.

The American rapper and fashion designer revealed the diagnosis in an interview with radio host Big Boy after hosting a listening party in Jackson Hole, Wyo., for his new album ‘YE.’

“I had never been diagnosed [with a mental condition] until I was 39,” West told Big Boy. “But like I said on the album, it’s not a disability, it’s a superpower.”

West did not specify in the interview what mental condition he was diagnosed with, but had written in his new album artwork that he was bipolar.

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“I hate being bipolar it’s awesome,” West wrote on his new album artwork of the mountains in Wyoming.

West also referenced his bipolar disorder in his new song Yikes. In the lyrics, the rapper called his bipolar disorder his “third person,” adding that the condition was his “superpower” and not a disability.

“I’m a superhero, I’m a superhero,” he added.

Watch Kanye West’s Interview with Big Boy below.