diff --git a/engine/components/BoundingBox.ts b/engine/components/BoundingBox.ts
index 5e21b2f..19967f7 100644
--- a/engine/components/BoundingBox.ts
+++ b/engine/components/BoundingBox.ts
@@ -47,8 +47,9 @@ export class BoundingBox extends Component {
       { x: this.dimension.width / 2, y: this.dimension.height / 2 },
       { x: this.dimension.width / 2, y: -this.dimension.height / 2 },
     ]
-      .map((vertex) => rotateVector(vertex, this.rotation))
+      .map((vertex) => rotateVector(vertex, this.rotation)) // rotate
       .map((vertex) => {
+        // translate
         return {
           x: vertex.x + this.center.x,
           y: vertex.y + this.center.y,
@@ -56,9 +57,10 @@ export class BoundingBox extends Component {
       });
   }
 
-  public getRotationInPiOfUnitCircle() {
+  public getRotationInPiOfUnitCircle(): number {
     let rads = this.rotation * (Math.PI / 180);
     if (rads >= Math.PI) {
+      // Physics system guarantees rotation \in [0, 360)
       rads -= Math.PI;
     }
     return rads;
diff --git a/engine/components/NetworkUpdateable.ts b/engine/components/NetworkUpdateable.ts
new file mode 100644
index 0000000..73ceeba
--- /dev/null
+++ b/engine/components/NetworkUpdateable.ts
@@ -0,0 +1,7 @@
+import { Component, ComponentNames } from ".";
+
+export class NetworkUpdateable extends Component {
+  constructor() {
+    super(ComponentNames.NetworkUpdateable);
+  }
+}
diff --git a/engine/components/index.ts b/engine/components/index.ts
index 67f1259..90f4965 100644
--- a/engine/components/index.ts
+++ b/engine/components/index.ts
@@ -12,4 +12,5 @@ export * from "./WallBounded";
 export * from "./Gravity";
 export * from "./Mass";
 export * from "./Moment";
+export * from "./NetworkUpdateable";
 export * from "./names";
diff --git a/engine/components/names.ts b/engine/components/names.ts
index e2ee3d3..02ee064 100644
--- a/engine/components/names.ts
+++ b/engine/components/names.ts
@@ -12,4 +12,5 @@ export namespace ComponentNames {
   export const Forces = "Forces";
   export const Mass = "Mass";
   export const Moment = "Moment";
+  export const NetworkUpdateable = "NetworkUpdateable";
 }
diff --git a/engine/structures/QuadTree.ts b/engine/structures/QuadTree.ts
index d1ff3b1..a57c6e7 100644
--- a/engine/structures/QuadTree.ts
+++ b/engine/structures/QuadTree.ts
@@ -41,17 +41,16 @@ export class QuadTree {
     this.dimension = dimension;
   }
 
-  public insert(id: number, dimension: Dimension2D, center: Coord2D): void {
-    const box: BoxedEntry = { id, center, dimension };
+  public insert(boxedEntry: BoxedEntry): void {
     if (this.hasChildren()) {
-      this.getQuadrants(box).forEach((quadrant) => {
+      this.getQuadrants(boxedEntry).forEach((quadrant) => {
         const quadrantBox = this.children.get(quadrant);
-        quadrantBox?.insert(id, dimension, center);
+        quadrantBox?.insert(boxedEntry);
       });
       return;
     }
 
-    this.objects.push({ id, dimension, center });
+    this.objects.push(boxedEntry);
 
     if (
       this.objects.length > this.splitThreshold &&
@@ -66,6 +65,7 @@ export class QuadTree {
 
   public clear(): void {
     this.objects = [];
+
     if (this.hasChildren()) {
       this.children.forEach((child) => child.clear());
       this.children.clear();
diff --git a/engine/systems/Collision.ts b/engine/systems/Collision.ts
index 2bba03b..1366ef4 100644
--- a/engine/systems/Collision.ts
+++ b/engine/systems/Collision.ts
@@ -63,7 +63,11 @@ export class Collision extends System {
         dimension = boundingBox.getOutscribedBoxDims();
       }
 
-      this.quadTree.insert(entity.id, dimension, boundingBox.center);
+      this.quadTree.insert({
+        id: entity.id,
+        dimension,
+        center: boundingBox.center,
+      });
     });
 
     // find colliding entities and perform collisions
diff --git a/engine/systems/Input.ts b/engine/systems/Input.ts
index 4aa9844..35d2e1d 100644
--- a/engine/systems/Input.ts
+++ b/engine/systems/Input.ts
@@ -9,7 +9,7 @@ import {
 import { Game } from "../Game";
 import { KeyConstants, PhysicsConstants } from "../config";
 import { Action } from "../interfaces";
-import { System, SystemNames } from "./";
+import { System, SystemNames } from ".";
 
 export class Input extends System {
   private keys: Set<string>;
diff --git a/engine/systems/NetworkUpdate.ts b/engine/systems/NetworkUpdate.ts
new file mode 100644
index 0000000..dc7be20
--- /dev/null
+++ b/engine/systems/NetworkUpdate.ts
@@ -0,0 +1,10 @@
+import { System, SystemNames } from ".";
+import { Game } from "../Game";
+
+export class NetworkUpdate extends System {
+  constructor() {
+    super(SystemNames.NetworkUpdate);
+  }
+
+  public update(_dt: number, _game: Game) {}
+}
diff --git a/engine/systems/index.ts b/engine/systems/index.ts
index 6cb6f35..075fc4e 100644
--- a/engine/systems/index.ts
+++ b/engine/systems/index.ts
@@ -6,3 +6,4 @@ export * from "./Input";
 export * from "./FacingDirection";
 export * from "./Collision";
 export * from "./WallBounds";
+export * from "./NetworkUpdate";
diff --git a/engine/systems/names.ts b/engine/systems/names.ts
index 23f31fc..cf66422 100644
--- a/engine/systems/names.ts
+++ b/engine/systems/names.ts
@@ -5,4 +5,5 @@ export namespace SystemNames {
   export const Input = "Input";
   export const Collision = "Collision";
   export const WallBounds = "WallBounds";
+  export const NetworkUpdate = "NetworkUpdate";
 }