--- /dev/null
+<?php
+
+namespace Drupal\content_moderation\Entity;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\user\EntityOwnerInterface;
+
+/**
+ * An interface for Content moderation state entity.
+ *
+ * Content moderation state entities track the moderation state of other content
+ * entities.
+ *
+ * @internal
+ */
+interface ContentModerationStateInterface extends ContentEntityInterface, EntityOwnerInterface {
+
+}