CHICAGO (WLS) -- An iconic actor is revealing a secret struggle that people watching him would never have known about.
Henry Winkler said dyslexia caused him to stumble over scripts, struggle with spelling and have difficulty with basic math.
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He wasn't diagnosed until the height of his fame, playing the Fonz on the hit 70s show "Happy Days," in his mid-30s.
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It took his stepson being diagnosed with dyslexia for him to realize what was going on.
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Winkler joined ABC7 Chicago Tuesday to talk about his memoir.
"Being Henry: The Fonz... and Beyond" is on sale now wherever books are sold.