--- a/handouts/ho05.tex	Tue Jan 28 12:23:53 2020 +0000
+++ b/handouts/ho05.tex	Mon Feb 03 01:10:16 2020 +0000
@@ -13,6 +13,9 @@
 % chomsky normal form transformation
 % https://youtu.be/FNPSlnj3Vt0
 
+% Language hierachy is about complexity
+%    How hard is it to recognise an element in a language
+
 \begin{document}
 
 \section*{Handout 5 (Grammars \& Parser)}