--- a/handouts/ho05.tex	Fri Nov 15 14:58:16 2019 +0000
+++ b/handouts/ho05.tex	Sun Nov 17 09:18:47 2019 +0000
@@ -8,7 +8,10 @@
 % http://www.mollypages.org/page/grammar/index.mp
 
 %% parsing scala files
-%%https://scalameta.org/
+%% https://scalameta.org/
+
+% chomsky normal form transformation
+% https://youtu.be/FNPSlnj3Vt0
 
 \begin{document}