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Good Charlotte frontman Joel Madden is working on a book.

“I’m lightly working on one,” the 30-year-old rocker revealed in an interview with PEOPLE during the Hollywood Stars Celebrity Softball game at Dodger Stadium on Saturday.

“It would be about my life,” Joel explains. “It would be about, mostly, the big changes in my life: Kids, relationships, moving to L.A…the big life changes that I’ve gone through.”

The longtime beau of Nicole Richie and soon-to-be father of two says that alhough the project is in it’s early stages, his memoir is unfolding nicely.

“I don’t want to put a book out there if it’s not actually meaningful. I’m not going to go there unless I can deliver.”