Abstract: Since the publication of Deutsches Gewässernamenbuch (DGNB), Berlin/Boston 2014, more hydronyms have been examined in recent research which the author would have included in the DGNB if he had known their localization, evidence and interpretations before the completion of the manuscript. To make them known in the lexicography of hydronyms, they are treated in this article as addenda to the DGNB in alphabetical order. The articles are executed in the same way as in the DGNB.