diff --git a/Assets/script/Heap.cs b/Assets/script/Heap.cs
index ac8f5c7be6926accbcf50f654be891279016d835..d3c694e56d8d317974e99d21c033c18ad72d4357 100644
--- a/Assets/script/Heap.cs
+++ b/Assets/script/Heap.cs
@@ -8,6 +8,8 @@ public class Heap <Tile> where Tile : HeapItem<Tile>{
     Tile[] heapTiles;
     int itemCount;
 
+    //replace openList with Heap
+
     //add heapIndex, compareTo to tile class
     //compare fCost of node then hCost
     //item.compareTo(item2) should return pos if item is less than item2, neg if item is greater than item2