diff --git a/releasenotes/notes/deprecate-nova-api-extensions-df16b02485dae203.yaml b/releasenotes/notes/deprecate-nova-api-extensions-df16b02485dae203.yaml
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index 0000000..c2d9a9b
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+++ b/releasenotes/notes/deprecate-nova-api-extensions-df16b02485dae203.yaml
@@ -0,0 +1,7 @@
+---
+deprecations:
+  - The *api_extensions* config option in the *compute-feature-enabled* group is
+    now deprecated. This option will be removed from tempest when all the
+    OpenStack releases supported by tempest no longer support the API extensions
+    mechanism. This was removed from Nova during the Newton cycle, so this will
+    be removed at the Mitaka EOL.