diff --git a/src/4-internals.adoc b/src/4-internals.adoc
index 610c465..784e70c 100644
--- a/src/4-internals.adoc
+++ b/src/4-internals.adoc
@@ -95,6 +95,29 @@ $ tree .git/objects/
 8 directories, 6 files
 ----
 
+=== !
+
+[graphviz,git-graph-complete,svg]
+----
+digraph g {
+    rankdir = LR
+	node[group=master];
+    1 -> 2 -> 3 -> 4 -> 7
+	node[group=branch];
+    5 [label = "commit 5"]
+    2 -> 5 -> 6
+    node[group=tree]
+    tree5 [label = "tree 5"]
+    5 -> tree5 [label="1"]
+    tree5 -> blob [label = "1..n"]
+    node[group=refs shape=note style=filled fillcolor=yellow];
+    edge[arrowhead = none style=dotted]
+    7 -> master
+    6 -> relecture
+    master -> HEAD
+}
+----
+
 === Exercice
 
 Prenons le dépôt https://github.com/Taeradan/hahp :