diff --git a/releasenotes/notes/xen_rename-03edd9b78f3e81e5.yaml b/releasenotes/notes/xen_rename-03edd9b78f3e81e5.yaml
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+++ b/releasenotes/notes/xen_rename-03edd9b78f3e81e5.yaml
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+---
+upgrade:
+  - XenServer hypervisor type has been changed from ``xen`` to ``XenServer``.
+    It could impact your aggregate metadata or your flavor extra specs if you
+    provide only the former.