The use of headers was adopted during the period of manuscripts and they were often written using red and blue ink alternately. In the upper margin, the title of the book or the chapter, the subject of the page or the leaf number was written. Following this practice, the printers of incunabula also printed information such as the title of the book or the chapter in the upper margin. These are called the "head title."

The title of the chapter "De Charitas" is printed in the upper margin.