diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 582527a796..c81a93d3f2 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -66,6 +66,9 @@
         `Surface` in `configure` and calls to a new method `detachOutputSurface`
         to remove a previously set `Surface` if the codec supports this
         (`MediaCodecInfo.detachedSurfaceSupported`).
+    *   Use `MediaCodecAdapter` supplied pixel aspect ratio values if provided
+        when processing `onOutputFormatChanged`
+        ([#1371](https://github.com/androidx/media/pull/1371)).
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