--- a/handouts/ho01.tex	Sat Jun 09 21:02:04 2018 +0100
+++ b/handouts/ho01.tex	Sun Aug 05 21:37:35 2018 +0100
@@ -180,7 +180,9 @@
 \noindent Note also that the convention in Scala is that
 \texttt{.r} converts a string into a regular expression. I
 leave it to you to ponder whether this regular expression
-really captures all possible web-addresses.
+really captures all possible web-addresses. If you need a quick
+recap about regular expressions, here is a quick video
+\url{https://youtu.be/bgBWp9EIlMM}.
 
 \subsection*{Why Study Regular Expressions?}