diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index 7115567aac..6da86096e4 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -1133,6 +1133,8 @@ function cancel_comment_reply_link($text = '') {
 /**
  * Retrieve hidden input HTML for replying to comments.
  *
+ * @since 3.0.0
+ *
  * @return string Hidden input HTML for replying to comments
  */
 function get_comment_id_fields() {