diff --git a/CHANGES.rst b/CHANGES.rst
index e4ccd4a3..04dc2f39 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -9,7 +9,8 @@ Bug Fixes
 Changes to API
 --------------
 
--
+- Use ``DataModel.__init__`` ``memmap`` argument when opening ASDF
+  files [#232]
 
 Other
 -----