diff --git a/core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php b/core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php
index 2e9998d..73ce605 100644
--- a/core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php
+++ b/core/lib/Drupal/Core/Render/MainContent/AjaxRenderer.php
@@ -75,6 +75,7 @@ public function renderResponse(array $main_content, Request $request, RouteMatch
     $output = $this->drupalRenderRoot($status_messages);
     $output_trimmed = trim($output);
     if (!empty($output_trimmed)) {
+      // There are messages so output them exactly as the theme renders them.
       $response->addCommand(new PrependCommand(NULL, $output));
     }
     return $response;