diff --git a/docs/releasenotes/7.0.0.rst b/docs/releasenotes/7.0.0.rst
index 386a26757..8219b76e8 100644
--- a/docs/releasenotes/7.0.0.rst
+++ b/docs/releasenotes/7.0.0.rst
@@ -92,3 +92,9 @@ Use instead:
 
     with Image.open("hopper.png") as im:
         im.save("out.jpg")
+
+Better thumbnail aspect ratio preservation
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+When calculating the new dimensions in ``Image.thumbnail``, round to the
+nearest integer, instead of always rounding down.