diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 8b3060f14..d271833e5 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -61,6 +61,7 @@
 **Enhancements**
 - **Accordion** - adds `onOpening` and `onClosing` callback (before animation) to go with `onOpen`, `onClose` (after animation) **Thanks @cluppric**
 - **Accordion** - Added `on` setting for specifying accordion trigger event.
+- **Activity Feed** - Activity feed has been rewritten to use `flexbox`
 - **API** - API now has new settings `throttleFirstRequest` and `interruptRequests`. Interrupt requests will abort a previous request on an element when making a new request. `throttleFirstRequest`, sets whether the first request or only subsequent requests should be throttled when a `throttle` duration is specified.
 - **Build Tools** - Build tools will now display pre-specified errors when a theme file is missing or an element specifies an unavailable theme.
 - **Build Tools** - Adjusting `site.variables` will now rebuild all UI, instead of just `site.less`