diff --git a/demo_start.sh b/demo_start.sh
index 1874f04..6257e38 100755
--- a/demo_start.sh
+++ b/demo_start.sh
@@ -29,6 +29,7 @@ fi
 
 # Démarrage de la machine
 echo "> Démarrage de la machine"
+date >> "$script_dir/demo_boot.log
 sudo lxc-start -n $LXC_NAME -o "$script_dir/demo_boot.log" -d
 sleep 3
 
diff --git a/demo_upgrade.sh b/demo_upgrade.sh
index 7abfc22..10c95a9 100755
--- a/demo_upgrade.sh
+++ b/demo_upgrade.sh
@@ -42,6 +42,7 @@ UPGRADE_DEMO_CONTAINER () {		# Démarrage, upgrade et snapshot
 	sudo sed -i "s@address $IP_MACHINE@address $IP_UPGRADE@" /var/lib/lxc/$MACHINE/rootfs/etc/network/interfaces
 
 	# Démarre le conteneur
+	date >> "$script_dir/demo_boot.log
 	sudo lxc-start -n $MACHINE -o "$script_dir/demo_boot.log" -d > /dev/null
 	sleep 10