diff --git a/README.md b/README.md
index 547113d..1489c46 100644
--- a/README.md
+++ b/README.md
@@ -61,13 +61,14 @@ IMAP user and password need to be given for the Nextcloud login.
 
 ### Configuration
 The parameters are `host, port, sslmode, domain`.
+Possible values for sslmode are `ssl` or `tls`.
 Add the following to your `config.php`:
 
     'user_backends' => array(
         array(
             'class' => 'OC_User_IMAP',
             'arguments' => array(
-                '127.0.0.1', 993, ssl, 'example.com'
+                '127.0.0.1', 993, 'ssl', 'example.com'
             ),
         ),
     ),