--- a/hws/hw04.tex	Thu Oct 08 12:08:10 2015 +0100
+++ b/hws/hw04.tex	Thu Oct 08 14:04:04 2015 +0100
@@ -5,6 +5,8 @@
 
 \section*{Homework 4}
 
+\HEADER
+
 \begin{enumerate}
 \item What should the architecture of a network application under Unix
   be that processes potentially hostile data?