Usually, when a player changes how a sport is played, the sport remembers him. That's not quite how it went for William "Dummy" Hoy, the Deaf center fielder who is widely credited with helping popularize the hand signals umpires still use today. More than 120 years after his last at-bat, a campaign is trying to fix that, and it just brought in one of the most recognizable voices in baseball to help.

On Oct. 21, the Sign For Hoy campaign released the trailer for Hoy: The Hands That Shaped the Game , a short documentary narrated by Bob Costas. “I've spent a good portion of my career telling baseball stories,” Costas said, according to Men's Journal . “This is one that deserves to be more widely known.”

The endorsement carries weight. The 74-year-old hosted 12 Olympics for NBC, called the World Series in the '90s, eulogized Mickey Mantle, and in 2018 received the Hall of Fame's Ford C.…