diff --git a/Classes/PHPExcel/ReferenceHelper.php b/Classes/PHPExcel/ReferenceHelper.php
index 98819b2e..4ccc2b59 100644
--- a/Classes/PHPExcel/ReferenceHelper.php
+++ b/Classes/PHPExcel/ReferenceHelper.php
@@ -259,6 +259,14 @@ class PHPExcel_ReferenceHelper
 			}
 		}
 
+		// Update worksheet: comments
+		$aComments = $pSheet->getComments();
+		$aNewComments = array(); // the new array of all comments
+		foreach ($aComments as $key => &$value) {
+			$newReference = $this->updateCellReference($key, $pBefore, $pNumCols, $pNumRows);
+			$aNewComments[$newReference] = $value;
+		}
+		$pSheet->setComments($aNewComments); // replace the comments array
 
 		// Update worksheet: hyperlinks
 		$aHyperlinkCollection = array_reverse($pSheet->getHyperlinkCollection(), true);
diff --git a/Classes/PHPExcel/Worksheet.php b/Classes/PHPExcel/Worksheet.php
index 1eed5ced..70ac3801 100644
--- a/Classes/PHPExcel/Worksheet.php
+++ b/Classes/PHPExcel/Worksheet.php
@@ -1941,6 +1941,19 @@ class PHPExcel_Worksheet implements PHPExcel_IComparable
 		return $this->_comments;
 	}
 
+	/**
+	 * Set comments array for the entire sheet.
+	 *
+	 * @param array of PHPExcel_Comment
+	 * @return PHPExcel_Worksheet
+	 */
+	public function setComments($pValue = array())
+	{
+		$this->_comments = $pValue;
+
+		return $this;
+	}
+
 	/**
 	 * Get comment for cell
 	 *
diff --git a/changelog.txt b/changelog.txt
index 5bdd44ad..5a90160f 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -67,6 +67,7 @@ Fixed in SVN:
 - Bugfix:	(MBaker) Work item 15379 - Named ranges with dot don't get parsed properly
 - Bugfix:	(MBaker) Work item 15096 - insertNewRowBefore fails to consistently update references
 - Bugfix:	(MBaker) "i" is not a valid character for Excel date format masks (in isDateTimeFormatCode() method)
+- Bugfix:	(MKunert) Work item 15421 - PHPExcel_ReferenceHelper::insertNewBefore() is missing an 'Update worksheet: comments' section
 - General:  (MBaker) Improved performance (speed), for building the Shared Strings table in the Excel2007 Writer.
 - General:  (MBaker) Improved performance (speed), for PHP to Excel date conversions
 - General:  (MBaker) Enhanced SheetViews element structures in the Excel2007 Writer for frozen panes.