diff --git a/chapter/layer3.tex b/chapter/layer3.tex
index 24d1359..7fc8d7b 100644
--- a/chapter/layer3.tex
+++ b/chapter/layer3.tex
@@ -49,7 +49,13 @@ Always remember the following points for Cisco devices:\cite{wiki:Administrative
 Used in IP networks (v4) and a \gls{lsr} protocol. Defined as OSPFv2 on \rfc{2328}
 from 1998. v1 first published as a \gls{rfc} back in 1989. From closely watching
 the development of the \gls{isis} routing protocol. As they were developed in
-the \gls{ietf} and the \gls{iso} organizations receptively.\cite{Theendle83:online}
+the \gls{ietf} and the \gls{iso} organizations 
+receptively.\cite{Theendle83:online}
+
+\gls{ospf} came from a need of replacing \gls{rip} with something else. Because 
+networks got larger and hop-count based metrics was not going to cut it anymore.
+So \gls{ospf} was born from closely watching the development of \gls{isis} 
+going on at around the same time.
 
 \subsection{Algorithm}