Customize message field of comment form wordpress

functions.php

function glowlogix_comment_field($comment_field){
    $comment_field =
        '<li class="col-sm-12">
            <textarea required placeholder="MESSAGE" class="form-control" name="comment" aria-required="true"></textarea>
        </li>';
    return $comment_field;
}
add_filter('comment_form_field_comment', 'glowlogix_comment_field');