 Aside from the name change, the significant difference was the distance of the race, changing from a half marathon to a 20 kilometres road race.The 20 km race featured only at the 2006 edition, and the half marathon distance returned for the 2007 World Road Running Championships.On 29 November 2007, the IAAF announced that the name of the competition would revert to its original title of the IAAF World Half Marathon Championships, beginning with the 2008 IAAF World Half Marathon Championships in Rio de Janeiro, Brazil on 12 October 2008.