diff --git a/talk-slides.pdf b/talk-slides.pdf
index 356390c..4e03986 100644
Binary files a/talk-slides.pdf and b/talk-slides.pdf differ
diff --git a/talk-slides.tex b/talk-slides.tex
index 57453b0..72d5570 100644
--- a/talk-slides.tex
+++ b/talk-slides.tex
@@ -173,17 +173,27 @@ communication}
 \subsection{ETSI ITS network architecture}
 \begin{frame}{ETSI ITS network architecture}
 
-\begin{itemize}
- \item \textbf{E}uropean \textbf{T}elecommunications \textbf{S}tandards \textbf{I}nstitute
- \item network technologies used in middle layers:
-    \begin{itemize}
-     \item GeoNetworking for geographical routing
-     \item BTP as transport protocol
-     \item IPv6 encapsulated in GeoNetworking
-     
-    \end{itemize}
+\begin{columns}
+  \begin{column}{0.49\textwidth}
 
-\end{itemize}
+  \begin{itemize}
+   \item \textbf{E}uropean \textbf{T}elecommunications \textbf{S}tandards \textbf{I}nstitute
+   \item network technologies used in middle layers:
+      \begin{itemize}
+       \item GeoNetworking for geographical routing
+       \item BTP as transport protocol
+       \item IPv6 encapsulated in GeoNetworking
+       
+      \end{itemize}
+  
+  \end{itemize}
+  \end{column}
+  
+  \begin{column}{0.52\textwidth}
+   \includegraphics[width=\textwidth]{figures/schema_internet_communication.png}
+  \end{column}
+
+\end{columns}
 
  
 \end{frame}
@@ -192,6 +202,7 @@ communication}
  \begin{itemize}
   \item problem: constant communication allows tracking of vehicles
   \item \textit{linkability} of messages threat to \textit{location privacy}
+  \item this survey: focus on middle network layers
   \item linkable identifiers in messages:
     \begin{itemize}
      \item vehicle position
@@ -328,7 +339,7 @@ communication}
 \subsection<presentation>*{For Further Reading}
 
 \begin{frame}[allowframebreaks]
-  \frametitle{Bibliography}
+  \frametitle{References}
     
   
   
@@ -341,7 +352,7 @@ communication}
  
  \center\huge{Thank you for your attention}
  
- \includegraphics[height=0.5\textheight]{figures/nomnompingu.png}\footnote{CC-BY-SA 3.0 by Elektroll}
+ \includegraphics[height=0.5\textheight]{figures/nomnompingu.png}\tiny\footnote{CC-BY-SA 3.0 by Elektroll}
  
 \end{frame}