diff --git a/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst b/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst
index f97c7b1a5..e01e5f93a 100644
--- a/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst
+++ b/developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_30.rst
@@ -186,6 +186,9 @@ Added APIs
 - ``OCP\Console\ReservedOptions`` was added and contains constants for options reserved for occ core features. ``--debug-log`` and ``--debug-log-level`` are now reserved by occ as they allow to show debug information to the output on any occ command.
 - ``OCP\Security\IHasher::validate()`` should return true if the passed string is a valid hash generated by ``OCP\Security\IHasher::hash()``
 - ``OCP\AppFramework\Http\JSONResponse()`` constructor now supports passing additional ``json_encode`` flags, see https://www.php.net/manual/en/function.json-encode.php for details
+- ``OCP\EventDispatcher\IWebhookCompatibleEvent`` is a new interface for events compatible with webhooks (`see webhook_listeners documentation <https://docs.nextcloud.com/server/latest/admin_manual/webhook_listeners/index.html>`_).
+- ``OCP\EventDispatcher\JsonSerializer`` is a new public helper for serializing users and fileinfos to json (ie for webhook events)
+- ``OCP\Files\Events\Node\AbstractNodeEvent`` and ``OCP\Files\Events\Node\AbstractNodesEvent`` now implements ``IWebhookCompatibleEvent`` so that all file/folder related events are available for webhooks.
 
 Changed APIs
 ^^^^^^^^^^^^