This is what it says
“A Labour government will immediately legislate for a referendum once elected.
“What will happen in a second referendum?
A second referendum won’t be a re-run of 2016. This time the choice will be between leaving with a sensible deal or remaining in the European Union.
A Labour government will negotiate a sensible deal within three months of being elected. It will be based on the things we have long advocated and discussed with the EU; trade unions and businesses, including a new customs union, a close single market relationship and guarantees of rights and protections.
Within six months of being elected we will put that deal to a public vote, alongside remain. Two clear options, both agreed with the EU – no false promises or bluster. Labour will then carry out whatever the people decide.”