diff --git a/modules/nw-udn-cr.adoc b/modules/nw-udn-cr.adoc
index 8e16c07a45..51d9bc96ef 100644
--- a/modules/nw-udn-cr.adoc
+++ b/modules/nw-udn-cr.adoc
@@ -11,6 +11,11 @@ Create a `UserDefinedNetwork` CR by using the CLI to enable namespace-scoped net
 
 The following procedure creates a `UserDefinedNetwork` CR that is namespace scoped. Based upon your use case, create your request by using either the `my-layer-two-udn.yaml` example for a `Layer2` topology type or the `my-layer-three-udn.yaml` example for a `Layer3` topology type.
 
+[NOTE]
+====
+When deploying a `UserDefinedNetwork` custom resource (CR) on {ibm-power-name} Virtual Server with installer-provisioned infrastructure (IPI), you must set the MTU size to `1300` or `1250`.
+====
+
 .Prerequisites
 
 * You have logged in with `cluster-admin` privileges, or you have `view` and `edit` role-based access control (RBAC).