diff --git a/core/modules/serialization/src/EntityResolver/ChainEntityResolver.php b/core/modules/serialization/src/EntityResolver/ChainEntityResolver.php
index 741399b..e1291c1 100644
--- a/core/modules/serialization/src/EntityResolver/ChainEntityResolver.php
+++ b/core/modules/serialization/src/EntityResolver/ChainEntityResolver.php
@@ -12,7 +12,7 @@
 /**
  * Resolver delegating the entity resolution to a chain of resolvers.
  */
-class ChainEntityResolver implements EntityResolverInterface {
+class ChainEntityResolver implements ChainEntityResolverInterface {
 
   /**
    * The concrete resolvers.
@@ -32,10 +32,7 @@ public function __construct(array $resolvers = array()) {
   }
 
   /**
-   * Adds an entity resolver.
-   *
-   * @param \Drupal\serialization\EntityResolver\EntityResolverInterface $resolver
-   *   The entity resolver to add.
+   * {@inheritdoc}
    */
   public function addResolver(EntityResolverInterface $resolver) {
     $this->resolvers[] = $resolver;
diff --git a/core/modules/serialization/src/EntityResolver/ChainEntityResolverInterface.php b/core/modules/serialization/src/EntityResolver/ChainEntityResolverInterface.php
new file mode 100644
index 0000000..16dcfc0
--- /dev/null
+++ b/core/modules/serialization/src/EntityResolver/ChainEntityResolverInterface.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\serialization\EntityResolver\ChainEntityResolverInterface
+ */
+
+namespace Drupal\serialization\EntityResolver;
+
+/**
+ * An interface for delegating a entity resolution to a chain of resolvers.
+ */
+interface ChainEntityResolverInterface extends EntityResolverInterface {
+
+  /**
+   * Adds an entity resolver.
+   *
+   * @param \Drupal\serialization\EntityResolver\EntityResolverInterface $resolver
+   *   The entity resolver to add.
+   */
+  public function addResolver(EntityResolverInterface $resolver);
+
+}