diff --git a/chapter/layer2protocols.tex b/chapter/layer2protocols.tex
index 4373ebf..a10c235 100644
--- a/chapter/layer2protocols.tex
+++ b/chapter/layer2protocols.tex
@@ -1,7 +1,7 @@
 \chapter{Protocols Layer 2}
 
-\subimport{./section/}{switchednetwork}
+\input{chapter/section/switchednetwork}
 
 \newpage
 
-\subimport{./section/}{spanningtree}
+\input{chapter/section/spanningtree}
diff --git a/chapter/layer3protocols.tex b/chapter/layer3protocols.tex
index 1325d4e..3227f5d 100644
--- a/chapter/layer3protocols.tex
+++ b/chapter/layer3protocols.tex
@@ -1,6 +1,6 @@
 \chapter{Protocols Layer 3}
 
-\subimport{./section/}{routednetwork}
+\input{chapter/section/routednetwork}
 
 \newpage
 
diff --git a/chapter/section/spanningtree.tex b/chapter/section/spanningtree.tex
index 4166a67..63409af 100644
--- a/chapter/section/spanningtree.tex
+++ b/chapter/section/spanningtree.tex
@@ -326,8 +326,12 @@ Cisco did on their part early on enhance the original spanning tree standard wit
 
 \fig{spanningtree/stpbestpractice}{stpbestpractice}{STP best practice}
 
-\section*{Online Ressources on STP}
+\subsection{Multiple Spanning Tree}
 
 \begin{itemize}
-    \item Spanning Tree \@WikiPedia \cite{wp_spanningtree}
-\end{itemize}
\ No newline at end of file
+    \item \itemtitle{Known limitations}{Regarding the cisco world of things}
+    \begin{enumerate}
+        \item A maximum of 16 instances is supported. {\footnotesize From 0 to 15.}
+    \end{enumerate}
+\end{itemize}
+        
\ No newline at end of file