diff --cc core/modules/config_translation/src/ConfigEntityMapper.php
index faf8991,348ad43..0000000
--- a/core/modules/config_translation/src/ConfigEntityMapper.php
+++ b/core/modules/config_translation/src/ConfigEntityMapper.php
diff --git a/core/modules/config_translation/src/ConfigEntityMapperInterface.php b/core/modules/config_translation/src/ConfigEntityMapperInterface.php
index c7cf262..65a4cc5 100644
--- a/core/modules/config_translation/src/ConfigEntityMapperInterface.php
+++ b/core/modules/config_translation/src/ConfigEntityMapperInterface.php
@@ -18,14 +18,15 @@
   public function getEntity();
 
   /**
-   * Sets the entity this configuration mapper is for.
+   * Sets the entity instance for this mapper.
    *
-   * 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.
+   * 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.
    *
-   * @param \Drupal\Core\Config\Entity\ConfigEntityInterface $entity
+   * @param \Drupal\Core\Config\Entity\ConfigEntityInterface
    *   The configuration entity to set.
    *
    * @return bool