(CNN) Gladys Knight's decision to sing the National Anthem at the Super Bowl has stirred controversy.

The legendary singer is being criticized for agreeing to take the gig in light of some fans boycotting the National Football League over its treatment of former San Francisco 49ers quarterback Colin Kaepernick.

Kaepernick has not been hired by an NFL team since he found himself at the center of debate for taking a knee at games during the National Anthem in protest of racial injustice.

The NFL announced Thursday that Knight would be performing at Super Bowl LIII, which is being held in her hometown.

She also tweeted the news.