diff --git a/HISTORY b/HISTORY
index 7a601f6..bfdc348 100755
--- a/HISTORY
+++ b/HISTORY
@@ -1,3 +1,7 @@
+Jul. 14 2016
+Fixed a boolean operation bug with the NOT statement on float number
+Improved boolean operation
+
 Jul. 13 2016
 Refactored error prompting