diff --git a/api/layer/object.go b/api/layer/object.go
index 67377ef4..17ace4f4 100644
--- a/api/layer/object.go
+++ b/api/layer/object.go
@@ -505,6 +505,8 @@ func (n *layer) initWorkerPool(ctx context.Context, size int, p allObjectParams,
 			default:
 			}
 
+			// We have to make a copy of pointer to data.NodeVersion
+			// to get correct value in submitted task function.
 			func(node *data.NodeVersion) {
 				wg.Add(1)
 				err = pool.Submit(func() {