diff --git a/CHANGES.rst b/CHANGES.rst
index 43c932c4..669d34ee 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,10 @@
+Unreleased
+==========
+
+- Number once again will allow you to serialize None to colander.null, this
+  reverts an accidental revert. See
+  https://github.com/Pylons/colander/issues/204#issuecomment-459556100
+
 1.6.0 (2019-01-31)
 ==================