diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/TermBreadcrumbBuilder.php b/core/modules/taxonomy/lib/Drupal/taxonomy/TermBreadcrumbBuilder.php
index 9aacdcb..339ecd9 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/TermBreadcrumbBuilder.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/TermBreadcrumbBuilder.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\taxonomy\TermBreadcrumbBuilder.
+ * Contains of Drupal\taxonomy\TermBreadcrumbBuilder.
  */
 
 namespace Drupal\taxonomy;
@@ -21,7 +21,9 @@ class TermBreadcrumbBuilder extends BreadcrumbBuilderBase implements BreadcrumbB
    */
   public function build(array $attributes) {
     if (!empty($attributes[RouteObjectInterface::ROUTE_NAME]) && $attributes[RouteObjectInterface::ROUTE_NAME] == 'taxonomy.term_page' && ($term = $attributes['taxonomy_term']) && $term instanceof TermInterface) {
-
+      // @todo This overrides any other possible breadcrumb and is a pure
+      //   hard-coded presumption. Make this behavior configurable per
+      //   vocabulary or term.
       $breadcrumb = array();
       while ($parents = taxonomy_term_load_parents($term->id())) {
         $term = array_shift($parents);