Index: src/wp-includes/user.php
===================================================================
--- src/wp-includes/user.php	(revision 27353)
+++ src/wp-includes/user.php	(working copy)
@@ -162,8 +162,8 @@
  * @since 2.8.0
  *
  * @param WP_User|WP_Error|null $user     WP_User or WP_Error object from a previous callback. Default null.
- * @param string                $username Username. If passed, cancels the cookie authentication.
- * @param string                $password Password. If passed, cancels the cookie authentication.
+ * @param string                $username Username. If not empty, cancels the cookie authentication.
+ * @param string                $password Password. If not empty, cancels the cookie authentication.
  * @return WP_User|WP_Error WP_User on success, WP_Error on failure.
  */
 function wp_authenticate_cookie($user, $username, $password) {