The Bibliotheca Teubneriana Latina is a definitive collection of Latin texts from the earliest times, through classical antiquity and the Middle Ages to the present. The online edition comprises the data of BTL 4, supplemented by the texts of all Latin editions of the Bibliotheca Scriptorum Graecorum et Romanorum Teubneriana printed by 2008. This means that formerly omitted texts from BT editions of the 19th and 20th centuries are now included, especially those of scholia and grammarians. The extension ranges around 1 million word forms, so that the BTL Online now includes approximately 13 million word forms in total.