diff --git a/core/modules/config_translation/src/ConfigEntityMapperInterface.php b/core/modules/config_translation/src/ConfigEntityMapperInterface.php
index 3d21a7b..d99dcaa 100644
--- a/core/modules/config_translation/src/ConfigEntityMapperInterface.php
+++ b/core/modules/config_translation/src/ConfigEntityMapperInterface.php
@@ -1,40 +1,29 @@
 <?php
 
-/**
- * @file
- * Contains \Drupal\config_translation\ConfigEntityMapperInterface.
- */
-
 namespace Drupal\config_translation;
 
-use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\Routing\RouteMatchInterface;
-use Symfony\Component\Routing\RouteCollection;
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * Defines an interface for configuration entity mapper.
+ * Defines an interface for configuration entity mappers.
  */
-interface ConfigEntityMapperInterface {
-
+interface ConfigEntityMapperInterface extends ConfigMapperInterface {
 
   /**
-   * Gets the entity instance for this mapper.
+   * Gets the entity this configuration mapper is for.
    *
    * @return \Drupal\Core\Config\Entity\ConfigEntityInterface $entity
    *   The configuration entity.
    */
   public function getEntity();
 
-
   /**
-   * Sets the entity instance for this mapper.
+   * Sets the entity this configuration mapper is for.
    *
-   * This method can only be invoked when the concrete entity is known, that is
-   * in a request for an entity translation path. After this method is called,
-   * the mapper is fully populated with the proper display title and
-   * configuration names to use to check permissions or display a translation
-   * screen.
+   * This method is invoked when the concrete entity is known from the route
+   * match on an entity translation path. After this method is called, the
+   * mapper is fully populated with the proper display title and configuration
+   * names to use to check permissions or display a translation screen.
    *
    * @param \Drupal\Core\Config\Entity\ConfigEntityInterface $entity
    *   The configuration entity to set.
@@ -44,15 +33,14 @@ public function getEntity();
    */
   public function setEntity(ConfigEntityInterface $entity);
 
-
   /**
-   * Set entity type for this mapper.
+   * Sets the entity type this mapper is for.
    *
-   * This should be set in initialization. A mapper that knows its type but
-   * not yet its names is still useful for router item and tab generation. The
-   * concrete entity only turns out later with actual controller invocations,
-   * when the setEntity() method is invoked before the rest of the methods are
-   * used.
+   * This should be set during initialization. A mapper that knows its type but
+   * not yet its entity (and, thus, its configuration names) is still useful for
+   * router item and tab generation. The concrete entity is only populated
+   * given a route match when the setEntity() method is invoked before using the
+   * mapper further.
    *
    * @param string $entity_type
    *   The entity type to set.
@@ -62,13 +50,11 @@ public function setEntity(ConfigEntityInterface $entity);
    */
   public function setType($entity_type);
 
-
   /**
-   * Gets the entity type from this mapper.
+   * Gets the entity type this mapper is for.
    *
    * @return string
    */
   public function getType();
 
-
 }