diff --git a/user_manual/groupware/sync_ios.rst b/user_manual/groupware/sync_ios.rst
index 85c20bc7c..a221ed12a 100644
--- a/user_manual/groupware/sync_ios.rst
+++ b/user_manual/groupware/sync_ios.rst
@@ -16,11 +16,17 @@ Calendar
 #. Enter your user name and password.
 #. Select Next.
 #. Open Advanced Settings
-#. For server, type the domain name of your server and username i.e. ``example.com/remote.php/dav/principals/users/username/``
+#. For server, type the domain name of your server and username, i.e., ``example.com/remote.php/dav/principals/users/username/``.
 #. Close Advanced Settings
 
 Your calendar will now be visible in the Calendar application.
 
+.. note:: If you get an error message related to SSL, you can try the following: Make sure that you
+   either specify both the protocol (``https://``) and the port (usually ``443``) in the ``Server`` field,
+   i.e., ``https://example.com:443/remote.php/dav/principals/users/username/``,
+   or none, like in the step-by-step guide above. Either way, the application automatically tries to use SSL,
+   which you can confirm in  “Advanced Settings” of the account after saving.   
+
 .. note:: Beginning with iOS 12 an SSL encryption is necessary. Therefore do **not** disable **SSL**
   (For this reason a certificate is required at your domain, https://letsencrypt.org/ will do).