Liu Song dynasty
During the fifth century, the Liu Song dynasty historian Pei Songzhi (372–451) extensively annotated Chen Shou's "Records of the Three Kingdoms" using a variety of other sources, augmenting the text to twice the length of the original. This work, completed in 429, became one of the official histories of the Three Kingdoms period, under the title "Sanguozhi zhu" (三国志注 "zhu" meaning "notes").