diff --git a/modules/ztp-acm-installing-disconnected-rhacm.adoc b/modules/ztp-acm-installing-disconnected-rhacm.adoc
index 1dccd2b0c227..e02e21faeb7f 100644
--- a/modules/ztp-acm-installing-disconnected-rhacm.adoc
+++ b/modules/ztp-acm-installing-disconnected-rhacm.adoc
@@ -15,6 +15,11 @@ Use {rh-rhacm-first}, {gitops-title}, and {cgu-operator-first} on the hub cluste
 * You have logged in as a user with `cluster-admin` privileges.
 
 * You have configured a disconnected mirror registry for use in the cluster.
++
+[NOTE]
+====
+The disconnected mirror registry that you create must contain a version of {cgu-operator} backup and pre-cache images that matches the version of {cgu-operator} running in the hub cluster. The spoke cluster must be able to resolve these images in the disconnected mirror registry.
+====
 
 .Procedure