diff --git a/bibliography.bib b/bibliography.bib
index f7adfb5..08aa799 100644
--- a/bibliography.bib
+++ b/bibliography.bib
@@ -276,7 +276,7 @@
   publisher = {{Wiley-VCH}},
   title = {Vorschläge zur Sicherung guter wissenschaftlicher Praxis},
   howpublished = {\href{http://d-nb.info/1043456643}{http://d-nb.info/1043456643}},
-  year = {2013}
+  year = {2013},
   address = {Weinheim, Germany},
 }