In Corpus Catalogorum Belgii. The Medieval Booklists of the Southern Low Countries all the existing medieval documents about libraries and book collections in Belgium have been edited, together with a complete repertory of the surviving books and manuscripts. The 7 volumes appeared between 1994 and 2016; each volume has an index of authors and works and an index of places and first names of persons. The present supplementary volume provides in three sections corrections and additions as well as two indices: an index of the c. 4500 manuscripts and incunables recorded in the series and presently kept in libraries all over the world, and an index of the c. 2000 last names of medieval persons mentioned.