diff --git a/wp-includes/query.php b/wp-includes/query.php
index 88440cba9..865c71c35 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -297,6 +297,20 @@ function is_feed () {
 	return $wp_query->is_feed;
 }
 
+/**
+ * Whether current page query is comment feed URL.
+ *
+ * @since 3.0.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
+function is_comment_feed () {
+	global $wp_query;
+
+	return $wp_query->is_comment_feed;
+}
+
 /**
  * Whether current page query is the front of the site.
  *