diff --git a/examples/ex11-row-group-collapse.php b/examples/ex11-row-group-collapse.php
new file mode 100644
index 000000000..7b640f2a4
--- /dev/null
+++ b/examples/ex11-row-group-collapse.php
@@ -0,0 +1,38 @@
+<?php
+set_include_path( get_include_path().PATH_SEPARATOR."..");
+include_once("xlsxwriter.class.php");
+
+$chars = 'abcdefgh';
+
+$writer = new XLSXWriter();
+
+$column_header = array('C1' => 'string');
+foreach (range(2, 11) as $col) {
+    $column_header[] = array("C$col" => 'integer');
+}
+$writer->writeSheetHeader('Sheet1', $column_header);
+
+$row_count = 0;
+foreach (range("a", "j") as $letter) {
+    $row_data = array($letter);
+    foreach (range(1, 10) as $col_count) {
+        $number = rand()%10000;
+        $row_data[] = $number;
+        @$total[$col_count] += $number;
+    }
+
+    /**
+     * Set outlineLevel=1 for collapsed rows and every 5th row
+     * set outlineLevel=0 and display totals
+     */
+    $row_options = array('collapse' => true, 'hidden' => true, 'outlineLevel' => 1);
+    $writer->writeSheetRow('Sheet1', $row_data, $row_options);
+    if (++$row_count % 5 === 0) {
+        $row_options = array('collapse' => true, 'hidden' => false, 'outlineLevel' => 0);
+        $writer->writeSheetRow('Sheet1', array_merge(array("Total after \"$letter\""), $total), $row_options);
+    }
+
+}
+
+$writer->writeToFile('xlsx-group-row-collapse.xlsx');
+echo '#'.floor((memory_get_peak_usage())/1024/1024)."MB"."\n";
diff --git a/xlsxwriter.class.php b/xlsxwriter.class.php
index a987735f8..ef47b8bc8 100644
--- a/xlsxwriter.class.php
+++ b/xlsxwriter.class.php
@@ -258,10 +258,11 @@ public function writeSheetRow($sheet_name, array $row, $row_options=null)
 		if (!empty($row_options))
 		{
 			$ht = isset($row_options['height']) ? floatval($row_options['height']) : 12.1;
+			$outlineLevel = isset($row_options['outlineLevel']) ? intval($row_options['outlineLevel']) : 0;
 			$customHt = isset($row_options['height']) ? true : false;
 			$hidden = isset($row_options['hidden']) ? (bool)($row_options['hidden']) : false;
 			$collapsed = isset($row_options['collapsed']) ? (bool)($row_options['collapsed']) : false;
-			$sheet->file_writer->write('<row collapsed="'.($collapsed).'" customFormat="false" customHeight="'.($customHt).'" hidden="'.($hidden).'" ht="'.($ht).'" outlineLevel="0" r="' . ($sheet->row_count + 1) . '">');
+			$sheet->file_writer->write('<row collapsed="'.($collapsed).'" customFormat="false" customHeight="'.($customHt).'" hidden="'.($hidden).'" ht="'.($ht).'" outlineLevel="'.($outlineLevel).'" r="' . ($sheet->row_count + 1) . '">');
 		}
 		else
 		{