diff --git a/releasenotes/notes/deprecate-os_glance_reserved-bace16f21facca3b.yaml b/releasenotes/notes/deprecate-os_glance_reserved-bace16f21facca3b.yaml
new file mode 100644
index 0000000..2834876
--- /dev/null
+++ b/releasenotes/notes/deprecate-os_glance_reserved-bace16f21facca3b.yaml
@@ -0,0 +1,11 @@
+---
+upgrade:
+  - |
+    Default value of the ``[image-feature-enabled] os_glance_reserved`` has
+    been changed from ``False`` to ``True`` and now the reservation of
+    os_glance namespace is tested by default.
+
+deprecations:
+  - |
+    The ``[image-feature-enabled] os_glance_reserved`` option has been
+    deprecatd because glance reserves the os_glance namespace since Wallaby.