diff --git a/src/manipulation.js b/src/manipulation.js
index 967c6068d..0ce24de18 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -9,6 +9,8 @@ var rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>
 	rscriptTypeMasked = /^true\/(.*)/,
 	rcleanScript = /^\s*<!(?:\[CDATA\[|--)|(?:\]\]|--)>\s*$/g,
 	wrapMap = {
+
+		// Support: IE 9
 		option: [ 1, "<select multiple='multiple'>" ],
 		legend: [ 1, "<fieldset>" ],
 		param: [ 1, "<object>" ],
@@ -19,6 +21,7 @@ var rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>
 		_default: [ 0, "" ]
 	};
 
+// Support: IE 9
 wrapMap.optgroup = wrapMap.option;
 wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
 wrapMap.th = wrapMap.td;
diff --git a/test/unit/manipulation.js b/test/unit/manipulation.js
index e88f71fda..8054fd075 100644
--- a/test/unit/manipulation.js
+++ b/test/unit/manipulation.js
@@ -395,7 +395,7 @@ var testAppendForObject = function( valueObj, isFragment ) {
 
 var testAppend = function( valueObj ) {
 
-	expect( 61 );
+	expect( 63 );
 
 	testAppendForObject( valueObj, false );
 	testAppendForObject( valueObj, true );
@@ -454,6 +454,10 @@ var testAppend = function( valueObj ) {
 	jQuery("#select1").append( valueObj("<OPTION>Test</OPTION>") );
 	equal( jQuery("#select1 option:last").text(), "Test", "Appending OPTION (all caps)" );
 
+	jQuery("#select1").append( valueObj("<optgroup label='optgroup'><option>optgroup</option></optgroup>") );
+	equal( jQuery("#select1 optgroup").attr("label"), "optgroup", "Label attribute in newly inserted optgroup is correct" );
+	equal( jQuery("#select1 option:last").text(), "optgroup", "Appending optgroup" );
+
 	jQuery("#table").append( valueObj("<colgroup></colgroup>") );
 	equal( jQuery("#table colgroup").length, 1, "Append colgroup" );