This means that as well as the current "take it or leave it" vote in principle on the Brexit deal, the final agreement will need to be enshrined in law and, importantly, be subject to scrutiny and a vote by MPs and peers.
Lawmakers have proposed 186 pages of amendments to the bill, which largely "copy and paste" European Union rules and regulations into British law but also, critics say, hand the government wide-ranging powers and cut parliament out of some Brexit planning.
"Once we have reached an agreement we will now bring forward a specific piece of primary legislation to implement that agreement, this will be known as the withdrawal agreement and implementation bill".
"This agreement will only hold if Parliament approves it".
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Opposition MPs and Tory rebels have been demanding such a concession.
Tory MP Antoinette Sandbach (Eddisbury) asked Mr Davis how any vote would be meaningful if a deal was only struck on the last day of negotiations.
He went on: "This confirms that the major policy set out in the withdrawal agreement will be directly implemented into United Kingdom law by primary legislation, not by secondary legislation with the Withdrawal Bill". It comes over and above the undertaking the government has already made that it will give parliament a vote on the final deal as soon as possible after the deal is agreed'. However, it would put Prime Minister Theresa May under pressure to request an extension to negotiations.
The decision was described as a "significant climbdown from a weak government on the verge of defeat" by Shadow Brexit Secretary, Sir Keir Starmer. However, like everything with this government the devil will be in the detail.
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Mr Davis said the probable sequence of events would see the withdrawal agreement concluded in the "latter part of next year", with the European Union aiming for October.
"A parliamentary vote simply isn't good enough", Liberal Democrat Brexit spokesman Tom Brake said.
Dominic Grieve, the Tory former attorney general who has tabled a series of amendments to the EU Withdrawal Bill, said the controversial clause nine in that Bill was now redundant.
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