diff --git a/docs/en-US/Release_Notes.xml b/docs/en-US/Release_Notes.xml
index dbd7520e5a4..15b452c7218 100644
--- a/docs/en-US/Release_Notes.xml
+++ b/docs/en-US/Release_Notes.xml
@@ -243,6 +243,15 @@ under the License.
the patch disk a VirtIO serial console is used to pass meta information to System VMs.
This enabled the deployment of System VMs on RBD Primary Storage.
+
+ Disk I/O polling and throttling
+ CLOUDSTACK-1192:
+ On KVM hypervisors polling and throttling of disk I/Os is supported. Per disk disk attached to
+ an Instance the usage server will record the amount of IOps.
+ Per disk offering you are able to specify the number of Read and Write I/Os. Trottling is
+ done by Qemu/KVM.
+ Both polling and throttling only works with KVM and with all types of Primary Storage.
+