diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b51acbb..11533e00 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Can read very small HTML files - [#194](https://github.com/PHPOffice/PhpSpreadsheet/issues/194)
 
+### BREAKING CHANGE
+
+- Constant `TYPE_DOUGHTNUTCHART` is now `TYPE_DOUGHNUTCHART`.
+
 ## [1.0.0-beta2] - 2017-11-26
 
 ### Added
diff --git a/src/PhpSpreadsheet/Chart/DataSeries.php b/src/PhpSpreadsheet/Chart/DataSeries.php
index 105f6505..1f434ae2 100644
--- a/src/PhpSpreadsheet/Chart/DataSeries.php
+++ b/src/PhpSpreadsheet/Chart/DataSeries.php
@@ -14,15 +14,15 @@ class DataSeries
     const TYPE_AREACHART_3D = 'area3DChart';
     const TYPE_PIECHART = 'pieChart';
     const TYPE_PIECHART_3D = 'pie3DChart';
-    const TYPE_DOUGHTNUTCHART = 'doughnutChart';
-    const TYPE_DONUTCHART = self::TYPE_DOUGHTNUTCHART; //    Synonym
+    const TYPE_DOUGHNUTCHART = 'doughnutChart';
+    const TYPE_DONUTCHART = self::TYPE_DOUGHNUTCHART; // Synonym
     const TYPE_SCATTERCHART = 'scatterChart';
     const TYPE_SURFACECHART = 'surfaceChart';
     const TYPE_SURFACECHART_3D = 'surface3DChart';
     const TYPE_RADARCHART = 'radarChart';
     const TYPE_BUBBLECHART = 'bubbleChart';
     const TYPE_STOCKCHART = 'stockChart';
-    const TYPE_CANDLECHART = self::TYPE_STOCKCHART; //    Synonym
+    const TYPE_CANDLECHART = self::TYPE_STOCKCHART; // Synonym
 
     const GROUPING_CLUSTERED = 'clustered';
     const GROUPING_STACKED = 'stacked';