diff --git a/changelog.mdx b/changelog.mdx
index c1db3554d..f61710bd2 100644
--- a/changelog.mdx
+++ b/changelog.mdx
@@ -7,6 +7,14 @@ 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="Aug 21, 2026" description="X API v2">
+  ### Broadcast start and end events for X Activity API
+
+  Today, we added `broadcast.start` and `broadcast.end` events to the [X Activity API](/x-api/activity/introduction). You can now subscribe by User ID to receive real-time notifications when a user starts or ends a live broadcast.
+
+  Both are public events and can be subscribed to with either app-only or user-context authentication. The `user_id` filter matches the user starting or ending the broadcast.
+</Update>
+
 <Update label="Aug 13, 2026" description="X Ads API">
   ### Updated `video_total_views` definition