--- a/cws/main_cw04.tex	Thu Nov 10 20:10:20 2022 +0000
+++ b/cws/main_cw04.tex	Mon Nov 14 12:04:21 2022 +0000
@@ -173,7 +173,7 @@
 computer. For example you can call Scala on the command line with the
 option \texttt{-cp knight1.jar} and then query any function from the
 \texttt{knight1.scala} template file. As usual you have to
-prefix the calls with \texttt{M4a}, \texttt{M4b} and \texttt{M4c}.
+prefix the calls with \texttt{M4a}, \texttt{M4b}, \texttt{M4c} and \texttt{M4d}.
 Since some of the calls are time sensitive, I included some timing
 information. For example