diff --git a/omeroweb/settings.py b/omeroweb/settings.py
index baa73fd316..28b8757b27 100755
--- a/omeroweb/settings.py
+++ b/omeroweb/settings.py
@@ -468,6 +468,11 @@ def leave_none_unset_int(s):
             "Controls where Django stores session data. See :djangodoc:"
             "`Configuring the session engine for more details <ref/settings"
             "/#session-engine>`."
+            "Allowed values are: ``omeroweb.filesessionstore`` (deprecated), "
+            "``django.contrib.sessions.backends.db``, "
+            "``django.contrib.sessions.backends.file``` ",
+            "``django.contrib.sessions.backends.cache``` or",
+            "``django.contrib.sessions.backends.cached_db``.",
         ),
     ],
     "omero.web.session_expire_at_browser_close": [