Starting change management.

Author: eohartman

modules/rosa-policy-change-management.adoc

@@ -174,10 +174,10 @@ machine pool using the OpenShift Cluster Manager or the ROSA CLI (`rosa`).
 
 - Set up and configure Amazon EBS to provision local node storage and persistent volume storage for the cluster.
 
-- Set up and configure the built-in image registry to use Amazon S3 bucket storage.
+- Set up and configure the built-in image registry to use Amazon S3 bucket storage. ^[1]^
 
 - Regularly prune image registry resources in
-Amazon S3 to optimize Amazon S3 usage and cluster performance.
+Amazon S3 to optimize Amazon S3 usage and cluster performance. ^[2]^
 
 | - Optionally configure the Amazon EBS CSI driver or the Amazon
 EFS CSI driver to provision persistent volumes on the cluster.
@@ -227,4 +227,10 @@ creation.
 |- Implement change management best practices for customer
 applications and data hosted on the AWS Cloud.
 
-|===
+|===
+
+^[1]^ The image registry makes API calls to Amazon S3, which sends images into an S3 bucket that is then retrieved in the image registry and used in the cluster.
+
+
+^[2]^ For more information on pruning images, see xref:../../rosa_architecture/pruning-images.adoc [Automatically Pruning Images] in
+{product-registry} image registry overview.