Change of proposal section

diff --git a/preparation.tex b/preparation.tex
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--- a/preparation.tex
+++ b/preparation.tex
@@ -8,7 +8,9 @@
 
 \section{Changes to Proposal}
 
-%      ns2/ns3
+\subsection{Network Simulator}
+
+While the original proposal indicated that the project would be written for ns2, after research into the simulator, I decided that it would advantageous to utilise ns3 instead. ns2 is the current defacto standard for network simulation. Released in 1996, it consists of C++ and oTcl scripts to reduce the number of recompilation required to perform network simulations. ns3 however is primarily written in C++, with Python bindings. Written on a base of GTNetS \cite{gtnets}, it is a simulator with much better scalability characterisitics. \cite{ns-comparison} It also includes a advanced feature set, and a number of papers have been written using it is a base, which shows it's depth as a simulator, \cite{ns3-1} and \cite{ns3-2}. Also, based on my evaluation of the code, ns3 provides much better separation of concerns and much more active development base. For these reasons I have chosen to use ns3 instead of ns2.
 
 \section{Learning}