New Zealanders now have a fifth option to choose from when deciding whether to change their flag after a popular campaign for a geometric design called "Red Peak" prompted lawmakers to change the rules to add it to the original four finalists.

New Zealand's Parliament on Thursday voted overwhelming to add Red Peak to a November referendum, after about 50,000 people signed a petition urging that the design be considered.

A government-appointed panel had earlier winnowed down more than 10,000 designs submitted by the public to four finalists. But many people felt those designs didn't offer enough choice, with three of them featuring silver ferns.

The flag that wins in November will be pitted head-to-head against the current flag in a second nationwide vote next March.