diff --git a/src/PhpSpreadsheet/Worksheet/Worksheet.php b/src/PhpSpreadsheet/Worksheet/Worksheet.php
index d0224037..cf257166 100644
--- a/src/PhpSpreadsheet/Worksheet/Worksheet.php
+++ b/src/PhpSpreadsheet/Worksheet/Worksheet.php
@@ -1096,7 +1096,7 @@ class Worksheet implements IComparable
      * @param string $column Return the highest data row for the specified column,
      *                                     or the highest data row of any column if no column letter is passed
      *
-     * @return string Highest row number that contains data
+     * @return int Highest row number that contains data
      */
     public function getHighestDataRow($column = null)
     {