MCO replace TP note in on-clusterlayering docs

Author: Michael Burke

modules/coreos-layering-configuring-on.adoc

@@ -21,8 +21,13 @@ You should not need to interact with these new objects or the `machine-os-builde
 
 You need a separate `MachineOSConfig` CR for each machine config pool where you want to use a custom layered image.
 
+:FeatureName: On-cluster image layering
+include::snippets/technology-preview.adoc[]
+
 .Prerequisites
 
+* You have enabled the `TechPreviewNoUpgrade` feature set by using the feature gates. For more information, see "Enabling features using feature gates".
+
 * You have a copy of the global pull secret in the `openshift-machine-config-operator` namespace that the MCO needs in order to pull the base operating system image.
 
 * You have a copy of the `etc-pki-entitlement` secret in the `openshift-machine-api` namespace.