diff --git a/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterServicesForDestructionPass.php b/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterServicesForDestructionPass.php
index ab89658..479fbd5 100644
--- a/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterServicesForDestructionPass.php
+++ b/core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterServicesForDestructionPass.php
@@ -13,6 +13,8 @@
 /**
  * Adds services tagged "needs_destruction" to the "kernel_destruct_subscriber"
  * service.
+ *
+ * @see \Drupal\Core\DestructableInterface
  */
 class RegisterServicesForDestructionPass implements CompilerPassInterface {
 
diff --git a/core/lib/Drupal/Core/DestructableInterface.php b/core/lib/Drupal/Core/DestructableInterface.php
index e06c6ec..536d8bd 100644
--- a/core/lib/Drupal/Core/DestructableInterface.php
+++ b/core/lib/Drupal/Core/DestructableInterface.php
@@ -9,6 +9,12 @@
 
 /**
  * The interface for services that need explicit destruction.
+ *
+ * This is useful for services that are likely to need termination or rebuild
+ * before the request formally ends.
+ *
+ * Services using this interface need to be registered with the
+ * "needs_destruction" tag.
  */
 interface DestructableInterface {
 
diff --git a/core/lib/Drupal/Core/EventSubscriber/KernelDestructionSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/KernelDestructionSubscriber.php
index 7cedb1c..9c3cfae 100644
--- a/core/lib/Drupal/Core/EventSubscriber/KernelDestructionSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/KernelDestructionSubscriber.php
@@ -14,6 +14,8 @@
 
 /**
  * Destructs services that are initiated and tagged with "needs_destruction".
+ *
+ * @see \Drupal\Core\DestructableInterface
  */
 class KernelDestructionSubscriber implements EventSubscriberInterface, ContainerAwareInterface {
 
diff --git a/core/modules/system/core.api.php b/core/modules/system/core.api.php
index 14c894a..dacffed 100644
--- a/core/modules/system/core.api.php
+++ b/core/modules/system/core.api.php
@@ -2152,7 +2152,8 @@ function hook_config_schema_info_alter(&$definitions) {
  *   for more information.
  * - needs_destruction: Indicates that a destruct() method needs to be called
  *   at the end of a request to finalize operations, if this service was
- *   instantiated.
+ *   instantiated. Services should implement \Drupal\Core\DestructableInterface
+ *   in this case.
  *
  * Creating a tag for a service does not do anything on its own, but tags
  * can be discovered or queried in a compiler pass when the container is built,