diff --git a/HISTORY.md b/HISTORY.md
index ea19923..bfd7c5e 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -43,6 +43,8 @@
 * Fixed bug that caused a crash when there was a `verbatim` environment
   followed by a blank line at the end of a question. [Mark George]
 
+* Updated to latest 2016 calculator rules.
+
 
 Version 2.3.1 (2014-09-15)
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