diff --git a/chapter/layer3.tex b/chapter/layer3.tex
index 299b019..75d948f 100644
--- a/chapter/layer3.tex
+++ b/chapter/layer3.tex
@@ -46,7 +46,10 @@ Always remember the following points for Cisco devices:\cite{wiki:Administrative
 
 \section{OSPF}
 
-Used in IP networks (v4) and a \gls{lsr} protocol. Defined as OSPFv2 on \rfc{2328} from 1998.
+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}