diff --git a/CHANGES.rst b/CHANGES.rst
index 5091c2f82..2419837bf 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -7,6 +7,9 @@ Changelog (Pillow)
 
 - This is the last Pillow release to support Python 2.7 #3642
 
+- Changed WindowsViewer format to PNG #4080
+  [radarhere]
+
 - Use TIFF orientation #4063
   [radarhere]