Add information about Face discovery.
Change-Id: Ie2d46b37c775da3db06e85228406896ecd3e6409
diff --git a/intro.tex b/intro.tex
index 87e47ce..6bba5b7 100644
--- a/intro.tex
+++ b/intro.tex
@@ -40,6 +40,10 @@
NLSR determines the adjacency status of neighboring routers using the Hello Protocol module (Section~\ref{sec:hello-protocol}).
When the Hello Protocol detects a status change for a neighbor, it will ask the LSDB module (Section~\ref{sec:lsdb}) to update the router's advertised adjacency information.
+Additionally, NLSR discovers the infrastructure for communicating with
+neighbors by querying NFD, which maintains a dataset of all
+information for its Faces.
+
\subsubsection{Disseminating Routing Information}
When a router's LSAs (Section~\ref{sec:lsas}) changes, the information of this change should be distributed to every other router in the network.