diff --git a/docs/usage.rst b/docs/usage.rst
index f55fda988a2835c0b588c90c29ea682c09c129ba..7fbc540568b06dc1977cab73ea2bcbb6911318dc 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -1057,6 +1057,10 @@ role.
    :file:`~/mysite/group_vars/communications.yml`
    ::
 
+      # Set the TLS private key and certificate.
+      xmpp_server_tls_certificate: "{{ lookup('file', 'tls/comms.example.com_xmpp.pem') }}"
+      xmpp_server_tls_key: "{{ lookup('file', 'tls/comms.example.com_xmpp.key') }}"
+
       # Set one of the users to also be an XMPP administrator.
       xmpp_administrators:
         - john.doe@example.com