diff --git a/src/wp-includes/query.php b/src/wp-includes/query.php
index 69055b3930..c0a071652e 100644
--- a/src/wp-includes/query.php
+++ b/src/wp-includes/query.php
@@ -399,7 +399,7 @@ function is_day() {
  *
  * @param string|string[] $feeds Optional. Feed type or array of feed types
  *                                         to check against. Default empty.
- * @return bool
+ * @return bool True if the query is for a feed, false on failure.
  */
 function is_feed( $feeds = '' ) {
 	global $wp_query;