diff --git a/HISTORY b/HISTORY
index f2775b7..7290db1 100755
--- a/HISTORY
+++ b/HISTORY
@@ -1,3 +1,6 @@
+Jun. 23 2016
+Added unary negative meta function overriding support for referenced usertype
+
 Jun. 21 2016
 Added lambda tracing
 Improved error prompting for wrong function reaching