Fix doc on VPN app

README.md

@@ -246,13 +246,14 @@ Using optional apps
 
 Some apps are not enabled by default :
 
-- *coin.vpn*: Management of VPN subscription and credentials
+- *vpn*: Management of OpenVPN subscription and credentials through LDAP
 
-You can enable them using the `EXTRA_INSTALLED_APPS` setting. Ex:
+You can enable them using the `EXTRA_INSTALLED_APPS` setting.
+E.g. in `settings_local.py`:
 
     EXTRA_INSTALLED_APPS = (
-        coin.vpn',
-    ]
+        'vpn',
+    )
 
 If you enable an extra-app after initial installation, make sure to sync database :