diff --git a/docs/changelog.rst b/docs/changelog.rst
index 45de682c..dbc64e7d 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -8,6 +8,7 @@ Development
 - BREAKING CHANGE: Changed the custom field validator (i.e `validation` parameter of Field) so that it now requires:
     the callable to raise a ValidationError (i.o return True/False).
 - Prevent an expensive call to to_mongo in Document.save() to improve performance #?
+- Improve perf of .save by avoiding a call to to_mongo in Document.save() #2049
 - Fix querying on List(EmbeddedDocument) subclasses fields #1961 #1492
 - Fix querying on (Generic)EmbeddedDocument subclasses fields #475
 - expose `mongoengine.connection.disconnect` and `mongoengine.connection.disconnect_all`