diff --git a/src/SharethisManager.php b/src/SharethisManager.php
index 3032396..182d92f 100644
--- a/src/SharethisManager.php
+++ b/src/SharethisManager.php
@@ -260,6 +260,10 @@ class SharethisManager implements SharethisManagerInterface {
       if (!empty($type)) {
         $attributes['displayText'] = Html::escape($display);
       }
+
+      // Alter to allow other module to change or add attribute elements.
+      \Drupal::moduleHandler()->alter('sharethis_attributes', $attributes);
+
       $meta_generator = array(
         '#type' => 'html_tag',
         '#tag' => 'span',