diff --git a/content/os/v1.x/en/installation/running-rancheros/cloud/openstack/_index.md b/content/os/v1.x/en/installation/running-rancheros/cloud/openstack/_index.md
index 300dcc34b20..7649d6e7e1a 100644
--- a/content/os/v1.x/en/installation/running-rancheros/cloud/openstack/_index.md
+++ b/content/os/v1.x/en/installation/running-rancheros/cloud/openstack/_index.md
@@ -3,6 +3,6 @@ title: OpenStack
 weight: 109
 ---
 
-As of v0.5.0, RancherOS releases include an Openstack image that can be found on our [releases page](https://github.com/rancher/os/releases). The image format is QCOW2.
+As of v0.5.0, RancherOS releases include an Openstack image that can be found on our [releases page](https://github.com/rancher/os/releases). The image format is [QCOW3](https://wiki.qemu.org/Features/Qcow3#Fully_QCOW2_backwards-compatible_feature_set) that is backward compatible with QCOW2.
 
 When launching an instance using the image, you must enable **Advanced Options** -> **Configuration Drive** and in order to use a [cloud-config]({{< baseurl >}}/os/v1.x/en/installation/configuration/#cloud-config) file.