diff --git a/src/interface.js b/src/interface.js
index 8a9b328..02d9d01 100644
--- a/src/interface.js
+++ b/src/interface.js
@@ -120,5 +120,8 @@ export function yDocToProsemirrorJSON (
     return response
   }
 
-  return items.map(serialize)
+  return {
+    type: 'doc',
+    content: items.map(serialize)
+  }
 }