diff --git a/core/lib/Drupal/Core/Menu/LocalTaskDefault.php b/core/lib/Drupal/Core/Menu/LocalTaskDefault.php
index 45e0f772..199a9d9 100644
--- a/core/lib/Drupal/Core/Menu/LocalTaskDefault.php
+++ b/core/lib/Drupal/Core/Menu/LocalTaskDefault.php
@@ -83,6 +83,9 @@ public function getTitle(Request $request = NULL) {
     if (isset($this->pluginDefinition['title_arguments']) && $title_arguments = $this->pluginDefinition['title_arguments']) {
       $args = (array) $title_arguments;
     }
+    // Variables in t() calls cannot be automatically extracted for translation
+    // (see https://www.drupal.org/node/2133321).
+    // But in this case the strings are already extracted from YML files.
     return $this->t($this->pluginDefinition['title'], $args, $options);
   }