diff --git a/changelog.d/7971.misc b/changelog.d/7971.misc
new file mode 100644
index 000000000000..87a4eb1f4d66
--- /dev/null
+++ b/changelog.d/7971.misc
@@ -0,0 +1 @@
+Log the SAML session ID during creation.
diff --git a/synapse/handlers/saml_handler.py b/synapse/handlers/saml_handler.py
index abecaa831356..2d506dc1f2de 100644
--- a/synapse/handlers/saml_handler.py
+++ b/synapse/handlers/saml_handler.py
@@ -96,6 +96,9 @@ def handle_redirect_request(
             relay_state=client_redirect_url
         )
 
+        # Since SAML sessions timeout it is useful to log when they were created.
+        logger.info("Initiating a new SAML session: %s" % (reqid,))
+
         now = self._clock.time_msec()
         self._outstanding_requests_dict[reqid] = Saml2SessionData(
             creation_time=now, ui_auth_session_id=ui_auth_session_id,