diff --git a/content/pong/ball/bouncing/motion_engine.md b/content/pong/ball/bouncing/motion_engine.md
index aa35f92..b501be7 100644
--- a/content/pong/ball/bouncing/motion_engine.md
+++ b/content/pong/ball/bouncing/motion_engine.md
@@ -231,6 +231,11 @@ Now, in the final block of our **MotionEngine**, we can perform our collision te
 ```cs
     ...
 
+    foreach (var entity in TrackedEntities)
+    {
+        ...
+    }
+    
     foreach (ref readonly var entity in ReadEntities<PositionComponent>())
     {
         ...