diff --git a/main.tex b/main.tex
index 8dd2b02ae143fe275b1ec22ca737deadaf77cb6b..7b6b4dc6198a1b800108676e1920f4150bd4b93a 100644
--- a/main.tex
+++ b/main.tex
@@ -378,5 +378,9 @@
 	\end{itemize}
 \end{frame}
 
+\begin{frame}{Purpose of walls}
+	MMP?
+\end{frame}
+
 
 \end{document}