Speaking to the press in the eastern town of Vukovar on Monday, Initiative member Snjezana Patko said that if the referendum was successful, it would change the legal regulation under which a national minority can exercise the right to use its language and script if it makes up a third of the local population.
She said Croatia would not breach international law with the proposed change, as the European Framework Convention for the Protection of National Minorities allows each state to regulate the percentage a minority must make to be entitled to officially use its language.
Signatures will be collected until December 1.
Reporters asked if the Initiative had scrapped plans to proclaim Vukovar a place of special reverence, which had been announced as a possible referendum question. Initiative member Vlado Iljkic said the Initiative would try to achieve that "through parliament when conditions are met."