The Secretary of State for Scotland stopped short of admitting tomorrow's referendum announcement will include detail on a single question.
Michael Moore admitted the Scottish Parliament has reached an agreement with the UK Government.
He said common ground was reached on making sure the vote was legal, fair and decisive.
He told ITV News: "Tomorrow we will be able to sign an agreement which will ensure we have a referendum on independence in Scotland that is legal, fair, decisive and is made in Scotland.
"It allows us to make the most important decision that Scots have made in 300 years. Do we stay part of the UK or do we go our separate way?
"We wanted to deliver a referendum that was legally watertight. That was fair and delivers the regular, recognised rules for a referendum. That it is decisive - that it gives us an outcome everybody can accept. On all those grounds we have secured what we wanted."