--- a/mercurial.tex
+++ b/mercurial.tex
@@ -971,11 +971,11 @@
 
 \begin{frame}{Maintaining Patch Series}
   The \ext{mq} extension makes it easy to maintain a patch series:
-
   \begin{center}
     \begin{tikzpicture}[start chain=stack going above, node distance=5mm]
       \tikzstyle{rev}+=[on chain,join]
-      \tikzstyle{patch}=[rev, draw=green!30!black!50, bottom color=green!30!black!20]
+      \tikzstyle{patch}=[rev,
+        draw=green!30!black!50, bottom color=green!30!black!20]
       \path[use as bounding box] (0,0) -- (0, 4.5);
 
       \node[on chain] {$\vdots$};
@@ -992,7 +992,7 @@
                     ([xshift=1cm] stack-3.center);
     \end{tikzpicture}
   \end{center}
-
+  Works nicely for local modification for upstream sources.
 \end{frame}
 
 \begin{frame}{Editing History}