The use of Glagolitic honours the village's first parish priest, Luka Sučić, a Glagolitic cleric who served in Komletinci from the founding of the parish in 1789 until his death in 1827. He celebrated services from Glagolitic books in Old Church Slavonic, while conducting rites and sermons in the living Croatian language, preserving national identity at a time when Latin was used in neighbouring parishes.
"Thanks to Sučić, the people of Komletinci proudly preserve and promote their Glagolitic heritage today. The Glagolitic street signs also contribute to the nationwide commemoration of 1,100 years of the Croatian Kingdom," the City of Otok said.
The Glagolitic script is the oldest script of the Croatians.