diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 959ca6fc86..2e5f5a9f5e 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -48,6 +48,12 @@
         `PlayerView.setEnableComposeSurfaceSyncWorkaround` in order to opt-in
         ([#1237](https://github.com/androidx/media/issues/1237),
         [#1594](https://github.com/androidx/media/issues/1594)).
+    *   Add `setFullscreenButtonState` to `PlayerView` to allow updates of
+        fullscreen button's icon on demand, i.e. out-of-band and not reactively
+        to a click interaction.
+        ([#1590](https://github.com/androidx/media/issues/1590),
+        [#184](https://github.com/androidx/media/issues/184),
+        [#10391](https://github.com/google/ExoPlayer/issues/10391))
 *   Downloads:
 *   OkHttp Extension:
 *   Cronet Extension: