diff --git a/HISTORY.md b/HISTORY.md
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--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,7 +1,7 @@
 # History
 
 
-## 2017-03-17, version 4.0.1
+## 2018-03-17, version 4.0.1
 
 - Fixed #1062: mathjs not working on ES5 browsers like IE11 and Safari 9.3.
 - Fixed #1061: `math.unit` not accepting input like `1/s`.