diff --git a/src/math/Ray.js b/src/math/Ray.js
index f81837f6a4ceec76db9560b470f07df0ec63a07e..b9e944f6505f00b78aafc3659f0d8b25122ee269 100644
--- a/src/math/Ray.js
+++ b/src/math/Ray.js
@@ -50,7 +50,7 @@ THREE.Ray.prototype = {
 		this.direction.copy( v ).sub( this.origin ).normalize();
 
 		return this;
-		
+
 	},
 
 	recast: function () {
@@ -121,7 +121,7 @@ THREE.Ray.prototype = {
 
 		return function ( v0, v1, optionalPointOnRay, optionalPointOnSegment ) {
 
-			// from http://www.geometrictools.com/LibMathematics/Distance/Wm5DistRay3Segment3.cpp
+			// from http://www.geometrictools.com/GTEngine/Include/Mathematics/GteDistRaySegment.h
 			// It returns the min distance between the ray and the segment
 			// defined by v0 and v1
 			// It can also set two optional targets :
@@ -442,7 +442,7 @@ THREE.Ray.prototype = {
 
 		return function ( a, b, c, backfaceCulling, optionalTarget ) {
 
-			// from http://www.geometrictools.com/LibMathematics/Intersection/Wm5IntrRay3Triangle3.cpp
+			// from http://www.geometrictools.com/GTEngine/Include/Mathematics/GteIntrRay3Triangle3.h
 
 			edge1.subVectors( b, a );
 			edge2.subVectors( c, a );