new file mode 100644
--- /dev/null
+++ b/library-upgrades.tex
@@ -0,0 +1,15 @@
+\begin{frame}{Handling Library Upgrades}
+  The goal:
+  \begin{itemize}
+  \item make the same fixes to \ext{libfoo} 2.0 as you did to 1.0
+  \end{itemize}
+
+  Vendor branches help you here:
+  \begin{itemize}
+  \item gives you clear distinction between
+    \begin{itemize}
+    \item changes made by the vendor
+    \item your own changes
+    \end{itemize}
+  \end{itemize}
+\end{frame}

--- a/vendor-branches.tex
+++ b/vendor-branches.tex
@@ -49,6 +49,7 @@
 \include{bundled-code}
 
 \include{library-maintenance}
+\include{library-upgrades}
 
 \section{Wrapping Up}