--- a/slides/slides01.tex	Fri Aug 16 08:45:21 2019 +0100
+++ b/slides/slides01.tex	Tue Oct 29 09:54:52 2019 +0000
@@ -20,6 +20,7 @@
 % beamer stuff 
 \renewcommand{\slidecaption}{PEP (Scala) \liningnums{01}, King's College London}
 
+%https://insights.stackoverflow.com/survey/2019#technology-most-loved-dreaded-and-wanted
 
 \begin{document}