diff -u b/core/lib/Drupal/Core/Entity/EntityFormBuilderInterface.php b/core/lib/Drupal/Core/Entity/EntityFormBuilderInterface.php
--- b/core/lib/Drupal/Core/Entity/EntityFormBuilderInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityFormBuilderInterface.php
@@ -10,8 +10,9 @@
 /**
  * Builds entity forms.
  *
- * This is like \Drupal\Core\Form\FormBuilderInterface but instead of a form_id
- * it is based on an entity.
+ * This is like \Drupal\Core\Form\FormBuilderInterface but instead of supplying
+ * the form class directly it looks up the class based on an entity and an
+ * operation.
  */
 interface EntityFormBuilderInterface {