diff --git a/doc/source/api-ref/index.rst b/doc/source/api-ref/index.rst
index 9ea3c06cc..e50983e3a 100644
--- a/doc/source/api-ref/index.rst
+++ b/doc/source/api-ref/index.rst
@@ -2,6 +2,8 @@
 REST API Reference
 ==================
 
+.. Please keep this list alphabetical
+
 StarlingX project REST API references:
 
 * `Bare Metal <metal/index.html>`__
@@ -10,6 +12,5 @@ StarlingX project REST API references:
 * `Fault Management <fault/index.html>`__
 * `High Availability <ha/index.html>`__
 * `NFV <nfv/index.html>`__
+* `PTP Status Notifications <ptp-notification-armada-app/index.html>`__
 * `Software Updates <update/index.html>`__
-
-