diff --git a/congress/datasources/monasca_driver.py b/congress/datasources/monasca_driver.py
index b61727bf8..c01bfd078 100644
--- a/congress/datasources/monasca_driver.py
+++ b/congress/datasources/monasca_driver.py
@@ -206,6 +206,10 @@ class MonascaWebhookDriver(datasource_driver.PushedDataSourceDriver):
     TRANSLATORS = [alarm_notification_translator]
 
     def __init__(self, name='', args=None):
+        LOG.warning(
+            'The Monasca webhook driver is classified as having unstable '
+            'schema. The schema may change in future releases in '
+            'backwards-incompatible ways.')
         super(MonascaWebhookDriver, self).__init__(name, args=args)
         if args is None:
             args = {}
diff --git a/congress/datasources/vitrage_driver.py b/congress/datasources/vitrage_driver.py
index c6a695b82..1cde174ff 100644
--- a/congress/datasources/vitrage_driver.py
+++ b/congress/datasources/vitrage_driver.py
@@ -80,6 +80,10 @@ class VitrageDriver(datasource_driver.PushedDataSourceDriver):
     TRANSLATORS = [webhook_alarm_translator]
 
     def __init__(self, name='', args=None):
+        LOG.warning(
+            'The Vitrage driver is classified as having unstable schema. '
+            'The schema may change in future releases in '
+            'backwards-incompatible ways.')
         super(VitrageDriver, self).__init__(name, args=args)
         if args is None:
             args = {}
diff --git a/doc/source/user/cloudservices.rst b/doc/source/user/cloudservices.rst
index 1f30f83d9..fc9d87537 100644
--- a/doc/source/user/cloudservices.rst
+++ b/doc/source/user/cloudservices.rst
@@ -120,15 +120,18 @@ has a differing degree of coverage for the available API calls.
  - OpenStack Keystone (v2 & v3)
  - OpenStack Mistral
  - OpenStack Monasca
+ - OpenStack Monasca Webhook (unstable schema: may change in future release)
  - OpenStack Murano
  - OpenStack Neutron (v2)
  - OpenStack Neutron QoS
  - OpenStack Nova
  - OpenStack Swift
- - Cloud Foundry
- - Plexxi
- - vCenter
+ - OpenStack Vitrage (unstable schema: may change in future release)
  - OPNFV Doctor
+ - Cloud Foundry (unofficial)
+ - Plexxi (unofficial)
+ - vCenter (unofficial)
+
 
 Using the API or CLI, you can review the list of tables and columns that a driver supports.
 Roughly, you can think of each table as a collection of objects (like networks or servers),