Agassi went public with private details of his two-year marriage to the actress in his tell all Open, but Shields insists he left a lot of details out.
And she hopes to address them in her memoirs - especially her ex-husband's account of a tantrum he threw on the set of sitcom Friends when Shields licked show regular Matt Le Blanc's hand in a scene.
Agassi, who was a visitor on set, revealed he stormed off, drove home and smashed his tennis awards, admitting, "I just lost it."
But Shields insists there's more to be told about the bizarre meltdown.
She tells Ladies Home Journal magazine, "Does he mention I spent the next three years replicating those trophies? He doesn’t say that, does he? Of course not. That’ll be in my book!"