diff --git a/src/main/java/model/ElementsUpdate.java b/src/main/java/model/ElementsUpdate.java
index 07db316adb7c1ab7df11b455de5de00b40844051..d0e05e3e5cab80c00133c12fbf1a31885648c10d 100644
--- a/src/main/java/model/ElementsUpdate.java
+++ b/src/main/java/model/ElementsUpdate.java
@@ -1,4 +1,9 @@
 package model;
 
+import util.Position;
+
+import java.util.List;
+
 public interface ElementsUpdate {
+    public List<Position> updateElements();
 }