After five days of debate on Theresa May's Brexit agreement, MPs will finally vote on the deal later.
The final day of debate will end with a speech from the prime minister at about 18:20 GMT.
But before the vote on the Brexit agreement happens, MPs will get a chance to reshape, or reject, the deal by voting on a series of amendments to it, from about 19:00 GMT.
This will start with votes on three or four backbench amendments that could reshape the deal. Each amendment will take about 15 minutes.
The vote on the withdrawal agreement itself is unlikely to happen before 20:00 and is expected to be followed by a statement from Mrs May.
John Bercow told MPs that if they back Sir Edward Leigh's amendment, John Baron's amendment will not be voted on.
There is a question mark over how far the government's withdrawal agreement could be modified by MPs before it no longer has force under international law, or the EU judges it to be in breach of what was agreed by Mrs May.
But Speaker Bercow has not selected this amendment to be put to the vote, although MPs will be able to refer to it during the debate.