New Zealand's Chief Electoral Officer is urging the Kiwi public to make sure they're correctly enrolled ahead of the first referendum on the country's flag.

To be able to vote in the first referendum, people must be enrolled by Thursday, November 19. Voting papers will be sent out from Friday, November 20.

People who wish to vote in the first flag referendum must be enrolled by November 19. Photo: File.

'If you're already enrolled, and have checked that your details are up to date, then that's great,” says Chief Electoral Officer Robert Peden.

'But if you've moved house, or aren't sure, or know you're not enrolled, you need to get on and do it now. It's easy.”

People can check that their enrolment details are up to date by visiting: www.elections.org.nz or by calling: 0800 36 76 56.

Enrolment forms are available via the above channels, by Freetexting your name and address to 3676, or at any PostShop.

The referendum runs from Friday, November 20 until Friday, December 11, and will be held by postal vote.

Voters will be asked the question: 'If the New Zealand flag changes, which flag would you prefer?”

People will be asked to rank the five alternative flag designs from numbers 1 to 5, and are free to rank as many or as few as they wish.

The most preferred alternative will go to a second referendum in March 2016, where voters will be asked to choose between the current flag and the preferred alternative.

'We want all eligible New Zealanders to have the opportunity to get enrolled and have their say,” says Mr Peden.