diff --git a/src/math/Ray.js b/src/math/Ray.js
index 58a4669328997d349bf0094593e847ee469226f3..5182aa4b38319ce1c4c3c130cb2c50e2e919eb14 100644
--- a/src/math/Ray.js
+++ b/src/math/Ray.js
@@ -234,8 +234,6 @@ THREE.Ray.prototype = {
 
 	intersectSphere: function () {
 
-		// from http://www.scratchapixel.com/lessons/3d-basic-lessons/lesson-7-intersecting-simple-shapes/ray-sphere-intersection/
-
 		var v1 = new THREE.Vector3();
 
 		return function ( sphere, optionalTarget ) {
@@ -350,8 +348,6 @@ THREE.Ray.prototype = {
 
 	intersectBox: function ( box, optionalTarget ) {
 
-		// http://www.scratchapixel.com/lessons/3d-basic-lessons/lesson-7-intersecting-simple-shapes/ray-box-intersection/
-
 		var tmin, tmax, tymin, tymax, tzmin, tzmax;
 
 		var invdirx = 1 / this.direction.x,