diff --git a/core/modules/migrate_drupal/src/Plugin/CckFieldMigrateSourceInterface.php b/core/modules/migrate_drupal/src/Plugin/CckFieldMigrateSourceInterface.php
index 45a4ebc..469d29f 100644
--- a/core/modules/migrate_drupal/src/Plugin/CckFieldMigrateSourceInterface.php
+++ b/core/modules/migrate_drupal/src/Plugin/CckFieldMigrateSourceInterface.php
@@ -9,6 +9,9 @@
 
 use Drupal\migrate\Plugin\MigrateSourceInterface;
 
+/**
+ * Defines an interface for cck field sources that need per type processing.
+ */
 interface CckFieldMigrateSourceInterface extends MigrateSourceInterface {
 
   /**
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/load/LoadEntity.php b/core/modules/migrate_drupal/src/Plugin/migrate/load/LoadEntity.php
index e8212dc..adbd919 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/load/LoadEntity.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/load/LoadEntity.php
@@ -85,6 +85,8 @@ public function loadMultiple(EntityStorageInterface $storage, array $sub_ids = N
         $migration->getSourcePlugin()->checkRequirements();
 
         $source_plugin = $migration->getSourcePlugin();
+        // Discuss simplifying per field type processing.
+        // @see https://www.drupal.org/node/2395993
         if ($source_plugin instanceof CckFieldMigrateSourceInterface) {
           foreach ($source_plugin->fieldData() as $field_name => $data) {
             // Specifically process the link field until core is fixed.