diff --git a/entitysystem/ecs.cpp b/entitysystem/ecs.cpp
index 99b6c292..8de653c0 100644
--- a/entitysystem/ecs.cpp
+++ b/entitysystem/ecs.cpp
@@ -13,7 +13,9 @@ entt::entity ECS::CreateObject()
 {
 	const auto e = world_.create();
 	world_.emplace<ECSComponent::Transform>(e);
-	world_.emplace<ECSComponent::Identification>(e);
+	// add UID
+	auto id = world_.emplace<ECSComponent::Identification>(e);
+	id.Id = nextId_++;
 	return e;
 }
 
diff --git a/entitysystem/ecs.h b/entitysystem/ecs.h
index 901c035f..444666a8 100644
--- a/entitysystem/ecs.h
+++ b/entitysystem/ecs.h
@@ -13,7 +13,9 @@
 class ECS final
 {
   private:
-	entt::registry world_;
+	entt::registry world_;  // scene registry
+	std::uint64_t nextId_ = 1; // 0 is invalid/none
+
 
   public:
 	//
@@ -147,5 +149,5 @@ class ECS final
 };
 
 extern ECS& GetComponentSystem();
-#define CS GetComponentSystem();
+#define CS GetComponentSystem()
 #endif // EU07_ECS_H