diff --git a/tempest/README.rst b/tempest/README.rst
index 113b191..c9a0491 100644
--- a/tempest/README.rst
+++ b/tempest/README.rst
@@ -26,10 +26,9 @@
 
 API tests are validation tests for the OpenStack API. They should not
 use the existing python clients for OpenStack, but should instead use
-the tempest implementations of clients. This allows us to test both
-XML and JSON. Having raw clients also lets us pass invalid JSON and
-XML to the APIs and see the results, something we could not get with
-the native clients.
+the tempest implementations of clients. Having raw clients let us
+pass invalid JSON to the APIs and see the results, something we could
+not get with the native clients.
 
 When it makes sense, API testing should be moved closer to the
 projects themselves, possibly as functional tests in their unit test
diff --git a/tempest/lib/common/rest_client.py b/tempest/lib/common/rest_client.py
index 7e1a442..9e42b8f 100644
--- a/tempest/lib/common/rest_client.py
+++ b/tempest/lib/common/rest_client.py
@@ -105,6 +105,9 @@
             timeout=http_timeout)
 
     def _get_type(self):
+        if self.TYPE != "json":
+            self.LOG.warning("Tempest has dropped XML support and the TYPE "
+                             "became meaningless")
         return self.TYPE
 
     def get_headers(self, accept_type=None, send_type=None):