diff --git a/src/math/Box2.js b/src/math/Box2.js
index f9578ee8e4b95978277a29aa98e1eb7463cf2f9b..e49193e4d0a8ce6888d38022074134d2c0f9a501 100644
--- a/src/math/Box2.js
+++ b/src/math/Box2.js
@@ -155,7 +155,8 @@ Object.assign( Box2.prototype, {
 
 	intersectsBox: function ( box ) {
 
-		// using 6 splitting planes to rule out intersections.
+		// using 4 splitting planes to rule out intersections
+
 		return box.max.x < this.min.x || box.min.x > this.max.x ||
 			box.max.y < this.min.y || box.min.y > this.max.y ? false : true;