diff --git a/src/wp-includes/rss.php b/src/wp-includes/rss.php
index 45e543c09c..6d8941ab38 100644
--- a/src/wp-includes/rss.php
+++ b/src/wp-includes/rss.php
@@ -836,7 +836,7 @@ class RSSCache {
 if ( !function_exists('parse_w3cdtf') ) :
 function parse_w3cdtf ( $date_str ) {
 
-	# regex to match wc3dtf
+	# regex to match W3C date/time formats
 	$pat = "/(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})(:(\d{2}))?(?:([-+])(\d{2}):?(\d{2})|(Z))?/";
 
 	if ( preg_match( $pat, $date_str, $match ) ) {