diff --git a/core/lib/Drupal/Core/Plugin/Discovery/ContainerDerivativeDiscoveryDecorator.php b/core/lib/Drupal/Core/Plugin/Discovery/ContainerDerivativeDiscoveryDecorator.php
index 017348e10f3aba442885f94e2a174ef8b08142e5..f6908b66e9da27d3171dd6058b3c7ce11fe446ba 100644
--- a/core/lib/Drupal/Core/Plugin/Discovery/ContainerDerivativeDiscoveryDecorator.php
+++ b/core/lib/Drupal/Core/Plugin/Discovery/ContainerDerivativeDiscoveryDecorator.php
@@ -4,6 +4,11 @@
 
 use Drupal\Component\Plugin\Discovery\DerivativeDiscoveryDecorator;
 
+/**
+ * Injects dependencies into derivers if they use ContainerDeriverInterface.
+ *
+ * @see \Drupal\Core\Plugin\Discovery\ContainerDeriverInterface
+ */
 class ContainerDerivativeDiscoveryDecorator extends DerivativeDiscoveryDecorator {
 
   /**