Expositiuncula in Ioannem Evangelistam ("Little Commentary on John the Evanglist") is a work by the ninth-century Benedictine monk Christian of Stavelot. As its name implies, it is a commentary on the Gospel of John. It is, however, not nearly as comprehensive as his earlier Expositio in Matthaeum Evangelistam.
Documenta Catholica Omnia website, Expositiuncula in Ioannem Evangelistam Online copy of typed translation.