diff -u b/core/lib/Drupal/Core/Annotation/QueueWorker.php b/core/lib/Drupal/Core/Annotation/QueueWorker.php
--- b/core/lib/Drupal/Core/Annotation/QueueWorker.php
+++ b/core/lib/Drupal/Core/Annotation/QueueWorker.php
@@ -18,7 +18,7 @@
  * by calling \Drupal\Core\Queue\QueueFactory::get($plugin_id).
  *
  * \Drupal\Core\Cron::processQueues() processes queues that use workers; they
- * can also be processed outside of the cron process, or even in parallel.
+ * can also be processed outside of the cron process.
  *
  * Some queues do not use worker plugins: you can create queues, add items to
  * them, claim them, etc. without using a QueueWorker plugin. However, you will