diff --git a/aodh/api/controllers/v2/alarms.py b/aodh/api/controllers/v2/alarms.py
index 823edbf1d..ceb3931d8 100644
--- a/aodh/api/controllers/v2/alarms.py
+++ b/aodh/api/controllers/v2/alarms.py
@@ -423,7 +423,8 @@ class Alarm(base.Base):
                     url = netutils.urlsplit(action)
                     if self._is_trust_url(url):
                         if '@' in url.netloc:
-                            continue
+                            errmsg = _("trust URL cannot contain a trust ID.")
+                            raise base.ClientSideError(errmsg)
                         if trust_id is None:
                             # We have a trust action without a trust ID,
                             # create it
diff --git a/aodh/notifier/trust.py b/aodh/notifier/trust.py
index 0cf24c34c..1cbc38d44 100644
--- a/aodh/notifier/trust.py
+++ b/aodh/notifier/trust.py
@@ -55,5 +55,5 @@ class TrustRestAlarmNotifier(TrustAlarmNotifierMixin, rest.RestAlarmNotifier):
     keystone authentication. It uses the aodh service user to
     authenticate using the trust ID provided.
 
-    The URL must be in the form ``trust+http://trust-id@host/action``.
+    The URL must be in the form ``trust+http://host/action``.
     """
diff --git a/aodh/notifier/zaqar.py b/aodh/notifier/zaqar.py
index e3a30a9a6..67474938c 100644
--- a/aodh/notifier/zaqar.py
+++ b/aodh/notifier/zaqar.py
@@ -193,7 +193,7 @@ class TrustZaqarAlarmNotifier(trust.TrustAlarmNotifierMixin,
                               ZaqarAlarmNotifier):
     """Zaqar notifier using a Keystone trust to post to user-defined queues.
 
-    The URL must be in the form ``trust+zaqar://trust_id@?queue_name=example``.
+    The URL must be in the form ``trust+zaqar://?queue_name=example``.
     """
 
     def _get_client_conf(self, auth_token):