diff --git a/src/Plugin/metatag/Tag/ExternalHreflang.php b/src/Plugin/metatag/Tag/ExternalHreflang.php
index 7e97cf000..619027ce0 100644
--- a/src/Plugin/metatag/Tag/ExternalHreflang.php
+++ b/src/Plugin/metatag/Tag/ExternalHreflang.php
@@ -80,7 +80,7 @@ public function form(array $element = []) {
    * {@inheritdoc}
    */
   public function description() {
-    return $this->t('Enter one link per hreflang, each separated by pipe (|) for code and url. Example: en-us|https://us.site.com/en[current-page:url:relative:en]');
+    return $this->t('Enter one link per hreflang, each separated by pipe (|) for code and url. Example: en-us|https://us.site.com/en[current-page:url:relative:en] <a href = "https://martinkura.com/list-hreflang-country-language-codes-attributes/" target = "blank">Hreflang Reference</a>');
   }

   /**