diff --git a/packages/state/synchronizer.js b/packages/state/synchronizer.js
index 4416c35..18d05df 100644
--- a/packages/state/synchronizer.js
+++ b/packages/state/synchronizer.js
@@ -13,6 +13,11 @@ export class Synchronizer {
     }
   }
 
+  addChild(child) {
+    this.children.push(child);
+    this.childrenPacketsForUpdate.push(child.packetsForUpdate.bind(child));
+  }
+
   packetsForUpdate(force = false) {
     const packetsForUpdate = [];
     for (let i = 0; i < this.childrenPacketsForUpdate.length; i++) {