Labour's National Executive Committee has ruled that Jeremy Corbyn will automatically be included on the ballot in the party's leadership contest.
But what happens now? Here's a look at how events will unfold.
Labour will set out the timetable for the contest on Thursday. It will include details of when nominations open and close along with the date the result is declared.
For two days next week people will be able to sign up to become registered supporters, a one-off status that gives them a vote in the contest, for £25.
The election will take place on a one-member-one-vote basis with members, affiliates and registered supporters taking part.
A special conference announcing the results is scheduled for September 24, according to the New Statesman.