On February 17, 2010, AF1 announced it would use the "Arena Football League" name. The league announced plans for the upcoming season and details of its contract with NFL Ne<answer>two</answer>rk to broadcast AFL games in 2010. AF1 teams were given the option of restoring historical names to their teams. In addition to the historical teams, the league added <answer>two</answer> new expansion franchises, the Dallas Vigilantes and the Jacksonville Sharks.
How many expansion teams were announced in 2010?
two