diff --git a/arbre.obj b/arbre.obj
new file mode 100644
index 0000000000000000000000000000000000000000..2139cf3d9609997aff66cf5fd36c8d062fb4bcb4
--- /dev/null
+++ b/arbre.obj
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diff --git a/git.tex b/git.tex
index b62838f74fec81f3a0a4874e10e3d282e9959b0e..e195d362c09c50e229e88b0e6d9012535f94501b 100644
--- a/git.tex
+++ b/git.tex
@@ -1455,7 +1455,19 @@
 \frame{\frametitle{Introduction}
   \begin{itemize}
   \item
-    Un moyen simple de savoir sur quelle branche on se trouve :\\
+    Chaque commit créé possède au moins un père : le commit dont il
+    est issu
+  \item
+    Il existe ainsi une filiation entre les différents commits d'un
+    dépôt, représentée sous forme d'arbre
+  \end{itemize}
+  \begin{center}
+    \includegraphics[width=8cm]{arbre.eps}
+  \end{center}
+}
+
+%======================================================================
+
     \mygit{git branch}{gitbranch1.txt}
   \end{itemize}
 }