diff --git a/oop/oop.pdf b/oop/oop.pdf
index bf3d10559c5767a897914f56684385f566fb94c7..70dc42da6c584d45054cd3561aca15ca988491ec 100644
Binary files a/oop/oop.pdf and b/oop/oop.pdf differ
diff --git a/oop/oop.tex b/oop/oop.tex
index 9dd075f9216ef476965ffc77a127f8abcd103fa3..50302292d6e45d7d23a8dd8e8ac12d239fdb50b7 100644
--- a/oop/oop.tex
+++ b/oop/oop.tex
@@ -28,7 +28,7 @@
 
 \author{Jonathan~K.~Vis}
 \institute[LUMC]{Dept. of Human Genetics, Leiden University Medical Center}
-\date{September 21st, 2017}
+\date{September 20th, 2017}
 \title{Object Oriented Programming}
 
 \begin{document}
@@ -36,6 +36,8 @@
 
 \begin{frame}
 \titlepage
+\vfill
+\hfill \textcolor{pms280_compl}{\texttt{j.k.vis@lumc.nl}}
 \end{frame}
 
 \begin{frame}[fragile]{Organizing data}