Index: wp-includes/comment-template.php
===================================================================
--- wp-includes/comment-template.php	(revision 35819)
+++ wp-includes/comment-template.php	(working copy)
@@ -2169,7 +2169,7 @@
 					$comment_fields = array( 'comment' => $args['comment_field'] ) + (array) $args['fields'];
 
 					/**
-					 * Filter the comment form fields.
+					 * Filter the comment form fields, including the textarea.
 					 *
 					 * @since 4.4.0
 					 *