diff --git a/docs/en-US/Release_Notes.xml b/docs/en-US/Release_Notes.xml
index 0d6fd802f05..0ef3b07e5f9 100644
--- a/docs/en-US/Release_Notes.xml
+++ b/docs/en-US/Release_Notes.xml
@@ -237,6 +237,10 @@ under the License.
           copied to Primary Storage once and using the cloning mechanism new disks will be cloned
           from this parent template. This saves space and decreases deployment time for Instances
           dramatically.</para>
+        <para>Cloning will however only work with new templates and when they are freshly downloaded
+            to primary storage. Templates currently stored on RBD Primary Storage are in RBD format 1
+            which does not support cloning. Loglevel debug on the Agent will show if cloning is used
+            when deploying a template or not.</para>
         <para>Before this release a NFS Primary Storage was still required for running the System
           VMs from. The reason behind this was a so called 'patch disk' which was generated by the
           hypervisor which contained metadata for the System VM. The scripts generating this disk