diff --git a/changelog.mdx b/changelog.mdx
index 718a882a2..66c7b8a69 100644
--- a/changelog.mdx
+++ b/changelog.mdx
@@ -7,6 +7,24 @@ keywords: ["changelog", "API updates", "release notes", "what's new", "API chang
 
 To subscribe to updates, please [**“Turn on notifications”**](https://help.x.com/en/managing-your-account/notifications-on-mobile-devices#:~:text=In%20the%20top%20menu,%20you,you%20would%20like%20to%20receive) for [**@API**](https://x.com/api). You can also follow this changelog in your feed reader via the [**RSS feed**](https://docs.x.com/changelog/rss.xml).
 
+<Update label="Sep 16, 2026" description="This week on the X Developer Platform">
+  ### New
+
+  **Livestream API is now available.** We published the [Livestream API](/livestream-api/introduction) for Enterprise developers. The section covers [Stream Sources](/livestream-api/sources/create-source), [Broadcasts](/livestream-api/broadcasts/create-broadcast), [Scheduled Broadcasts](/livestream-api/scheduled-broadcasts/create-scheduled-broadcast), and [Live Chat](/livestream-api/chat/accessing-live-chat). Start with [Getting Started](/livestream-api/getting-started) and [Authentication](/livestream-api/authentication). Access requires an Enterprise plan; request it via the [Enterprise interest form](/forms/enterprise-api-interest).
+
+  **Broadcast chat moderator endpoints.** You can now manage chat moderators for your broadcasts through the Livestream API. Moderators are scoped to the authenticated user and apply across every broadcast that user hosts.
+
+  - [`GET /2/broadcasts/chat/moderators`](/livestream-api/chat/list-moderators) lists your chat moderators
+  - [`POST /2/broadcasts/chat/moderators`](/livestream-api/chat/add-moderator) adds a chat moderator
+  - [`DELETE /2/broadcasts/chat/moderators/{id}`](/livestream-api/chat/remove-moderator) removes a chat moderator
+
+  Each user can have up to 20 moderators; adding a 21st returns `400 Bad Request`. All three endpoints accept OAuth 2.0 user context and OAuth 1.0a.
+
+  ### Updated
+
+  **`post_id` filter qualifier for `like.create` on X Activity API.** You can now scope [`like.create`](/x-api/activity/introduction) subscriptions to a specific Post by adding `"qualifiers": { "post_id": "<post-id>" }` to the filter. Only likes on that Post are delivered.
+</Update>
+
 <Update label="Sep 15, 2026" description="X Ads API">
   ### Lead Generation API