diff --git a/lang/en_utf8/auth.php b/lang/en_utf8/auth.php
index 4c4f051..9e74a55 100644
--- a/lang/en_utf8/auth.php
+++ b/lang/en_utf8/auth.php
@@ -33,22 +33,25 @@ $string['auth_nologindescription'] = 'Auxiliary plugin that prevents user to log
 $string['auth_nologintitle'] = 'No login';
 
 // CAS plugin
-$string['auth_cas_proxycas_key'] = "Proxy mode";
-$string['auth_cas_logoutcas_key'] = "Logout CAS";
-$string['auth_cas_multiauth_key'] = "Multi-authentication";
-$string['auth_cas_proxycas'] = "Turn this to 'yes'' if you use CASin proxy-mode";
-$string['auth_cas_logoutcas'] = "Turn this to 'yes'' if tou want to logout from CAS when you deconnect from Moodle";
-$string['auth_cas_multiauth'] = "Turn this to 'yes'' if you want to have multi-authentication (CAS + other authentication)";
-$string['accesCAS'] = "CAS users";
-$string['accesNOCAS'] = "other users";
-$string['CASform'] = "Authentication choice";
+$string['auth_cas_proxycas_key'] = 'Proxy mode';
+$string['auth_cas_logoutcas_key'] = 'Logout CAS';
+$string['auth_cas_multiauth_key'] = 'Multi-authentication';
+$string['auth_cas_proxycas'] = 'Set this to \'yes\' if you use CAS in proxy-mode';
+$string['auth_cas_logoutcas'] = 'Set this to \'yes\' if you want to logout from CAS when you logout of Moodle';
+$string['auth_cas_multiauth'] = 'Set this to \'yes\' if you want users to be able to choose between CAS and other enabled login methods on the login screen';
+$string['auth_cas_subauth_key'] = 'Sub-authentication module';
+$string['auth_cas_subauth'] = 'CAS is only used for authentication; to retrieve user details, another authentication method must be used.  Here you can choose the backing authentication module which will be used to retrieve user details.  The settings for the sub-authentication plugin can be edited on the Admin->Users->Authentication page.';
+$string['auth_cas_subauth_usernotfound'] = 'CAS has authenticated you, but no details for your account have been retrieved from our identification server.<br />This may mean that the two servers are slightly out of synch.  Please try again in a few minutes.  <br />If you still have problems logging in, please contact <a href=\"$a->href\">$a->linktext</a>.';
+$string['accessCAS'] = 'CAS users login';
+$string['accessNOCAS'] = 'Other users';
+$string['CASform'] = 'Authentication choice';
 $string['auth_cas_logincas'] = 'Secure connection access';
 $string['auth_cas_invalidcaslogin'] = 'Sorry, your login has failed - you could not be authorised';
 $string['auth_cas_server_settings'] = 'CAS server configuration';
 $string['auth_castitle'] = 'CAS server (SSO)';
 $string['auth_cas_hostname'] = 'Hostname of the CAS server <br />eg: host.domain.fr';
-$string['auth_cas_baseuri'] = 'URI of the server (nothing if no baseUri)<br />For example, if the CAS server responds to host.domaine.fr/CAS/ then<br />cas_baseuri = CAS/';
-$string['auth_cas_port'] = 'Port of the CAS server';
+$string['auth_cas_baseuri'] = 'URI of the server (leave empty if not required)<br />For example, if the CAS server responds to host.domaine.fr/CAS/ then<br />enter CAS/';
+$string['auth_cas_port'] = 'Port where the CAS server listens';
 $string['auth_cas_version'] = 'Version of CAS';
 $string['auth_cas_language'] = 'Selected language';
 $string['auth_casdescription'] = 'This method uses a CAS server (Central Authentication Service) to authenticate users in a Single Sign On environment (SSO). You can also use a simple LDAP authentication. If the given username and password are valid according to CAS, Moodle creates a new user entry in its database, taking user attributes from LDAP if required. On following logins only the username and password are checked.';