diff -u b/core/modules/block/src/BlockListBuilder.php b/core/modules/block/src/BlockListBuilder.php
--- b/core/modules/block/src/BlockListBuilder.php
+++ b/core/modules/block/src/BlockListBuilder.php
@@ -90,7 +90,7 @@
    * @param \Drupal\Core\Theme\ThemeManagerInterface $theme_manager
    *   The theme manager.
    * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
-   *   The theme manager.
+   *   The theme handler.
    * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
    *   The form builder.
    */