diff --git a/core/lib/Drupal/Core/Link.php b/core/lib/Drupal/Core/Link.php
index 6810fb0..b726558 100644
--- a/core/lib/Drupal/Core/Link.php
+++ b/core/lib/Drupal/Core/Link.php
@@ -61,6 +61,9 @@ public function __construct($text, Url $url) {
    *   - 'absolute': Defaults to FALSE. Whether to force the output to be an
    *     absolute link (beginning with http:). Useful for links that will be
    *     displayed outside the site, such as in an RSS feed.
+   *   - 'attributes': An associative array of HTML attributes that will be
+   *     added to the anchor tag if you use the \Drupal\Core\Link class to make
+   *     the link.
    *   - 'language': An optional language object used to look up the alias
    *     for the URL. If $options['language'] is omitted, it defaults to the
    *     current language for the language type LanguageInterface::TYPE_URL.