diff -r 4fcc88f06d5e -r be79edaf06e1 slides/slides02.tex
--- a/slides/slides02.tex	Thu Oct 15 09:22:33 2020 +0100
+++ b/slides/slides02.tex	Sat Oct 17 13:14:19 2020 +0100
@@ -895,6 +895,8 @@
 \end{tikzpicture}
 \end{center}
 
+code by Archie Collard
+
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%