diff --git a/src/wp-includes/comment-template.php b/src/wp-includes/comment-template.php
index 3714cbfc3c..7028d5c65c 100644
--- a/src/wp-includes/comment-template.php
+++ b/src/wp-includes/comment-template.php
@@ -2153,6 +2153,7 @@ function wp_list_comments( $args = array(), $comments = null ) {
  * in the array of fields.
  *
  * @since 3.0.0
+ * @since 4.1.0 Introduced the 'class_submit' argument.
  * @since 4.2.0 Introduced 'submit_button' and 'submit_fields' arguments.
  *
  * @param array       $args {