diff --git a/docs/keystone.smartcity.conf b/docs/keystone.smartcity.conf
index 274aa2f..71de202 100644
--- a/docs/keystone.smartcity.conf
+++ b/docs/keystone.smartcity.conf
@@ -1,6 +1,11 @@
 ### For a LDAP integration, create smartcity service and then
 ### put this file in /etc/keystone/domains/keystone.smartcity.conf
 ###
+### In order of ajust `user`, `suffix`, `user_tree_dn`, `user_objectclass`, `group_tree_dn`, `group_object_class`
+### and rest of user and groups attributes you should discover your ldap using a command like:
+### ldapsearch -x -h <ldap_host> -w <ldap_admin_password> -D "cn=admin,dc=openstack,dc=org" -b "dc=openstack,dc=org"
+###
+
 [identity]
 driver = ldap