diff --git a/src/SitewideAlertRenderer.php b/src/SitewideAlertRenderer.php
index 2c3dc43..5b17bce 100644
--- a/src/SitewideAlertRenderer.php
+++ b/src/SitewideAlertRenderer.php
@@ -69,7 +69,7 @@ class SitewideAlertRenderer implements SitewideAlertRendererInterface {
     }
 
     $build = [
-      '#markup' => '<div data-sitewide-alert></div>',
+      '#markup' => '<div data-sitewide-alert aria-live="polite" id="sitewide-alert"></div>',
       '#attached' => [
         'library' => [
           'sitewide_alert/init',