diff --git a/CHANGES.rst b/CHANGES.rst
index 89ce2a332..cd78a53e9 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -35,6 +35,7 @@
   to allow lazy deserialization of ASDF tagged tree nodes to
   custom objects. [#1733]
 
+- deprecate ``copy_arrays`` in favor of ``memmap``, and set ``memmap=False`` by default [#1797]
 
 3.2.0 (2024-04-05)
 ------------------