Index: wp-includes/comment-template.php
===================================================================
--- wp-includes/comment-template.php	(revision 18407)
+++ wp-includes/comment-template.php	(working copy)
@@ -1247,6 +1276,9 @@
 			case 'ol':
 				echo "<ol class='children'>\n";
 				break;
+			case 'article':
+				echo "<article>\n";
+				break;
 			default:
 			case 'ul':
 				echo "<ul class='children'>\n";
@@ -1271,6 +1303,9 @@
 			case 'ol':
 				echo "</ol>\n";
 				break;
+			case 'article':
+				echo "</article>\n";
+				break;
 			default:
 			case 'ul':
 				echo "</ul>\n";
@@ -1334,13 +1369,15 @@
 			call_user_func($args['callback'], $comment, $args, $depth);
 			return;
 		}
-
 		$GLOBALS['comment'] = $comment;
 		extract($args, EXTR_SKIP);
 
 		if ( 'div' == $args['style'] ) {
 			$tag = 'div';
 			$add_below = 'comment';
+		} else if ( 'article' == $args['style'] ) {
+			$tag = 'article';
+			$add_below = 'comment';
 		} else {
 			$tag = 'li';
 			$add_below = 'div-comment';
@@ -1393,6 +1430,8 @@
 		}
 		if ( 'div' == $args['style'] )
 			echo "</div>\n";
+		else if ( 'article' == $args['style'] )
+			echo "</article>\n";
 		else
 			echo "</li>\n";
 	}