diff --git a/core/lib/Drupal/Core/Config/ConfigImporter.php b/core/lib/Drupal/Core/Config/ConfigImporter.php
index 60f7182..ada5841 100644
--- a/core/lib/Drupal/Core/Config/ConfigImporter.php
+++ b/core/lib/Drupal/Core/Config/ConfigImporter.php
@@ -295,6 +295,10 @@ protected function importConfig($op, $name) {
    * @param string $name
    *   The name of the configuration to process.
    *
+   * @throws \Drupal\Core\Entity\EntityStorageException
+   *   Thrown if the data is owned by an entity type, but the entity storage
+   *   does not support imports.
+   *
    * @return bool
    *   TRUE if the configuration was imported as a configuration entity. FALSE
    *   otherwise.
diff --git a/core/lib/Drupal/Core/Config/Entity/ImportableEntityStorageInterface.php b/core/lib/Drupal/Core/Config/Entity/ImportableEntityStorageInterface.php
index 39ae1df..6aca4df 100644
--- a/core/lib/Drupal/Core/Config/Entity/ImportableEntityStorageInterface.php
+++ b/core/lib/Drupal/Core/Config/Entity/ImportableEntityStorageInterface.php
@@ -12,9 +12,8 @@
 /**
  * Provides an interface for responding to configuration imports.
  *
- * These methods are invoked when configuration is synchronized between storages
- * and allows the entity storage to take over the synchronization of
- * configuration data.
+ * When configuration is synchronized between storages, the entity storage must
+ * handle the synchronization of configuration data for its entity.
  */
 interface ImportableEntityStorageInterface {