diff --git a/INSTALL b/INSTALL
index c46bd6c9c9..6f9168d20b 100644
--- a/INSTALL
+++ b/INSTALL
@@ -6,6 +6,7 @@ Prerequisites
 
  * Python 2.4 or later (http://www.python.org/)
  * trytond (http://www.tryton.org/)
+ * trytond_ldap_connection (http://www.tryton.org/)
  * python-ldap (http://python-ldap.sourceforge.net/)
 
 Installation