--- a/cws/cw01.tex	Fri Nov 17 14:11:58 2017 +0000
+++ b/cws/cw01.tex	Tue Nov 21 16:31:11 2017 +0000
@@ -21,8 +21,8 @@
 \mbox{\texttt{scala <<filename.scala>>}} on the commandline.
 
 \item Do not use any mutable data structures in your
-submissions! They are not needed. This means you cannot use 
-\texttt{ListBuffer}s, for example. 
+submissions! They are not needed. This means you cannot create new 
+\texttt{Array}s or \texttt{ListBuffer}s, for example. 
 
 \item Do not use \texttt{return} in your code! It has a different
   meaning in Scala, than in Java.