diff --git a/HISTORY b/HISTORY
index 9793c12..25384a8 100755
--- a/HISTORY
+++ b/HISTORY
@@ -1,6 +1,7 @@
 Dec. 25 2015
 Added support to put a class instance into a variable
 Improved error handling with sub routine and class
+Fixed an unary calculation issue
 Fixed a memory leak in class definition
 Polished code