Champollion inscribed this copy of the published paper with alphabetic hieroglyphs meaning ‘à mon ami Dubois’ (‘to my friend Dubois’). Champollion made a second crucial breakthrough in 1824, realising that the alphabetic signs were used not only for foreign names, but also for the Egyptian language and names. Together with his knowledge of the Coptic language, which derived from ancient Egyptian, this allowed him to begin reading hieroglyphics.