--- a/hws/hw04.tex	Wed Oct 05 08:50:44 2016 +0100
+++ b/hws/hw04.tex	Fri Oct 07 12:29:30 2016 +0100
@@ -96,6 +96,7 @@
 differences between the {\it read rule} of the Bell-LaPadula access
 policy and the Biba access policy. Do the same for the {\it write rule}.
 
+\item \POSTSCRIPT
 \end{enumerate}