--- a/mercurial.tex
+++ b/mercurial.tex
@@ -385,6 +385,26 @@
   \end{center}
 \end{frame}
 
+\begin{frame}{Distributed Revision Control}
+  Mercurial duplicates the history on many servers:
+  \begin{center}
+    \begin{tikzpicture}[start chain]
+      \tikzstyle{every node}=[repository, minimum height=18mm, text width=15mm,]
+      \tikzstyle{every path}=[<->]
+
+      \node (a) at (4,5) {Alice};
+      \node (l) at (0,6) {Alice's Laptop};
+      \node (b) at (1,1) {Bob};
+      \node (c) at (7,2) {Carla};
+
+      \draw (a) -- (l);
+      \draw (a) -- (b);
+      \draw (b) -- (c);
+      \draw (c) -- (a);
+    \end{tikzpicture}
+  \end{center}
+\end{frame}
+
 
 \section{Using Mercurial}