diff --git a/docs/source/changelog.rst b/docs/source/changelog.rst
index 34b444a34f..34506e237f 100644
--- a/docs/source/changelog.rst
+++ b/docs/source/changelog.rst
@@ -4,6 +4,11 @@ Changelog
 Here's a summary of what's changed in each Corda release. For guidance on how to upgrade code from the previous
 release, see :doc:`app-upgrade-notes`.
 
+Unreleased
+----------
+
+* Fix a bug in Corda 4.0 that combined commands in ``TransactionBuilder`` if they only differed by the signers list.  The behaviour is now consistent with prior Corda releases.
+
 .. _changelog_v4.0:
 
 Version 4.0