diff --git a/object/types.proto b/object/types.proto
index 1d8a749..819b25e 100644
--- a/object/types.proto
+++ b/object/types.proto
@@ -29,6 +29,9 @@ enum ObjectType {
 
   // Object lock
   LOCK = 3;
+
+  // Initialization part of the split regular object
+  INIT = 4;
 }
 
 // Type of match expression
@@ -181,6 +184,8 @@ message Header {
     // the same `split_id` value.
     bytes split_id = 6 [json_name = "splitID"];
 
+    // todo
+    neo.fs.v2.refs.ObjectID init = 7 [json_name = "init"];
   }
   // Position of the object in the split hierarchy
   Split split = 11 [json_name = "split"];
@@ -222,4 +227,7 @@ message SplitInfo {
   // split header with the original object header and a sorted list of
   // object parts.
   neo.fs.v2.refs.ObjectID link = 3;
+
+  // todo
+  neo.fs.v2.refs.ObjectID init_part = 4;
 }