diff --git a/src/Skobkin/Bundle/PointToolsBundle/Command/UpdateSubscriptionsCommand.php b/src/Skobkin/Bundle/PointToolsBundle/Command/UpdateSubscriptionsCommand.php
index 5996b62..2d1e837 100644
--- a/src/Skobkin/Bundle/PointToolsBundle/Command/UpdateSubscriptionsCommand.php
+++ b/src/Skobkin/Bundle/PointToolsBundle/Command/UpdateSubscriptionsCommand.php
@@ -15,6 +15,9 @@ use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 
+/**
+ * @todo https://symfony.com/doc/current/console/lockable_trait.html
+ */
 class UpdateSubscriptionsCommand extends ContainerAwareCommand
 {
     /**