diff --git a/changelog.mdx b/changelog.mdx
index b965396ee..499253944 100644
--- a/changelog.mdx
+++ b/changelog.mdx
@@ -7,6 +7,21 @@ 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 4, 2026" description="X API v2">
+  ### OAuth 2.0 user context for webhook and subscription management
+
+  You can now use OAuth 2.0 user-context authentication to manage webhooks and [X Activity API](/x-api/activity/introduction) subscriptions:
+
+  - [Webhook endpoints](/x-api/webhooks/introduction) (`GET`/`POST /2/webhooks`, `PUT`/`DELETE /2/webhooks/{webhook_id}`) now accept OAuth 2.0 user context. `GET /2/webhooks` also now accepts OAuth 1.0a.
+  - X Activity API subscription endpoints (`PUT`/`DELETE /2/activity/subscriptions/{subscription_id}`) now accept OAuth 2.0 user context and OAuth 1.0a, in addition to app-only Bearer tokens.
+
+  This means you can manage webhooks and subscriptions with the same fine-grained OAuth 2.0 user tokens you use elsewhere, instead of switching to an app-only Bearer token.
+
+  ### Lower streaming latency: P99 now ~4-5 seconds
+
+  We improved delivery latency on [volume streaming endpoints](/x-api/fundamentals/consuming-streaming-data). Hydrated streams, including the [Filtered Stream](/x-api/posts/filtered-stream/introduction), now deliver Posts with a P99 latency of approximately **4-5 seconds**, down from ~6-7 seconds. No changes are required on your end. If you need the lowest possible latency, see [Powerstream](/x-api/powerstream/introduction).
+</Update>
+
 <Update label="Sep 1, 2026" description="X API v2">
   ### Media upload and Post-create size and duration limits