\subsubsection{Writing protocol handlers}
-You can add custom protocol handlers by adding shell scripts to
-\texttt{/lib/network}. They provide the following two shell functions:
+You can add custom protocol handlers (e.g: PPPoE, PPPoA, ATM, PPTP ...)
+by adding shell scripts to \texttt{/lib/network}. They provide the following
+two shell functions:
\begin{Verbatim}
scan_<protocolname>() {