Commentaríolum, commentatíoli, pen. cor. Diminut. Cic.A little register or memoriall: a short worke.Perfectum omni ratione commentariolum.Cic.Prositentium cõmentariolis aliquid vulgatum esse. Quint. Commentariensis. Paul. He that keepeth the register or note of publike actes. Also a laylour.
Lewis and Short: Latin dictionary
commentārĭŏlum, i, n. (-lus, i, m., Hier. Ep. 149, 1), dim. [commentarius], a short treatise, brief commentary: hoc, Q. Cic. Pet. Cons. 14 fin.; of dub. form,