Adding unit tests for verifying 'isEmpty()', custom null value serialization
diff --git a/release-notes/VERSION b/release-notes/VERSION
index 8bc568d..9bbffaa 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -10,6 +10,8 @@
 
 Improvements
 
+* [JACKSON-695]: Add 'isEmpty(value)' in JsonSerializer to allow
+  customizing handling of serialization of empty values
 * [JACKSON-749]: Make @JsonValue work for Enum deserialization
 
 New features: