OSDOCS-14472: RN for prefix feature

Author: skopacz1

release_notes/ocp-4-19-release-notes.adoc

@@ -464,6 +464,14 @@ For more information, see xref:../updating/preparing_for_updates/updating-cluste
 [id="ocp-release-notes-machine-management_{context}"]
 === Machine management
 
+[id="ocp-4-19-cpms-prefix_{context}"]
+==== Custom prefixes for control plane machine names
+
+With this release, you can customize the prefix of machine names for machines created by the control plane machine set.
+This feature is enabled by modifying the `spec.machineNamePrefix` parameter of the `ControlPlaneMachineSet` custom resource.
+
+For more information, see xref:../machine_management/control_plane_machine_management/cpmso-configuration.adoc#cpmso-config-prefix_cpmso-configuration[Adding a custom prefix to control plane machine names].
+
 [id="ocp-release-notes-monitoring_{context}"]
 === Monitoring