παρεπι-γρᾰφή · parepi-graphē — LSJ
something written in the margin, Sammelb. 6995.26,7362.1 (both ii A.D.) ; esp. stage-direction (such as αὐλεῖ, Ar. Av. 223), Sch. A. Eu. 117, Sch. Ar. Nu. 3, al.
incidental statement, as a rhetorical figure, Tz. ad Lyc. 1. .