What does the exclamation point in this code stating?

confirmGuest = () => {
  this.setState( prevState => ({ 
    isConfirmed: !_________.isConfirmed
  }));
}

Is the above saying to update the state of isConfirmed through the negation of its previous state? So, if the previous state of isConfirmed is false, then we're changing it to true with the exclamation point, right?