Eminem’s 2002 album The Eminem Show recently turned 15, and the Detroit rapper shared some insight into the project’s inspiration. In a handwritten note he posted on Instagram—that also included credits for the album—he explained that the 1998 film The Truman Show was the driving force behind the album’s creation.

“My life felt like it was becoming a circus around that time and I felt like I was always being watched,” he wrote. This falls in line with the film’s plot; Jim Carrey plays a man unwittingly living inside a TV show, where his life is broadcast to viewers around the world.

The Eminem Show is one of the most successful albums of all time, moving over 10 million copies in the U.S. alone. It also spawned hit singles like “Cleanin' Out My Closet,” “Sing For the Moment” featuring Dina Rae, and “Superman.”

You can see his note above and catch up on all the lyrics to Eminem’s The Eminem Show on Genius now.