diff --git a/CHANGES.rst b/CHANGES.rst
index 28474887..91f97f12 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -7,3 +7,6 @@
 
 - Fix validation behavior when an object with nested None values is
   assigned to a DataModel attribute. [#45]
+
+- Rename is_builtin_fits_keyword to make clear that it is
+  used outside of this package. [#47]