--- a/hws/hw04.tex	Thu Oct 08 18:46:15 2015 +0100
+++ b/hws/hw04.tex	Tue Oct 13 03:45:37 2015 +0100
@@ -13,7 +13,8 @@
 
 \item What is a unikernel system and why is a unikernel
 preferable on a web server system (in contrast to a traditional
-general purpose operating system like Linux).
+general purpose operating system like Linux). Hint: What is
+the idea of a unikernel.
 
 \item What does the principle of least privilege say?