service/lists.md

@@ -157,6 +157,14 @@ If you were a moderator or admin on a mailing list, simply [sign up
 for an account](https://lists.torproject.org/mailman3/accounts/signup/?next=/mailman3/postorius/lists/) and you should be able to access the list
 moderation facilities.
 
+Note that for site-wide administration, there's a different
+"superuser" concept in the web interface. For this, you need to make a
+new account just like during the first install, with:
+
+    django-admin createsuperuser --pythonpath /usr/share/mailman3-web --settings settings --username USER-admin --email USER+admin@torproject.org
+
+The `USER-admin` account must not already exist.
+
 ## Pager playbook
 
 <!-- information about common errors from the monitoring system and -->