diff --git a/oop/oop.pdf b/oop/oop.pdf
index 051d6a9c43551f343faff2c46f54fe6c3cc47df5..817319fdc85fc59211bc3803cd0f86fd516254d0 100644
Binary files a/oop/oop.pdf and b/oop/oop.pdf differ
diff --git a/oop/oop.tex b/oop/oop.tex
index ba91e673ad2bf5448052a706b90691c06c1afce0..ad08e1eccfe2ecef305f9e11f64bdb4cb2c0b209 100644
--- a/oop/oop.tex
+++ b/oop/oop.tex
@@ -362,8 +362,8 @@ class Vector(object):
 \item \textcolor{pms280_compl}{Abstract away} implementation by
 specifying interfaces and behaviour;
 
-\item Use \textcolor{pms280_compl}{inheritance} (not covered) to give an
-even nicer abstraction;
+\item Use \textcolor{pms280_compl}{inheritance} (not covered here)
+to give an even nicer (layered) abstraction;
 
 \item \textcolor{pms280_compl}{Create} own data type on top of what
 Python provides;
@@ -404,7 +404,7 @@ containing two integers: \mintinline{python}{numerator} and
 
 \bigskip
 
-see: \path{https://link.com/assignment}
+see: \path{https://github.com/lumc-python/oop}
 \end{frame}
 
 \end{document}