diff --git a/src/extensions/core/load3d/conditional-lines/ColoredShadowMaterial.js b/src/extensions/core/load3d/conditional-lines/ColoredShadowMaterial.js
index 9043636355..16784283b6 100644
--- a/src/extensions/core/load3d/conditional-lines/ColoredShadowMaterial.js
+++ b/src/extensions/core/load3d/conditional-lines/ColoredShadowMaterial.js
@@ -1,3 +1,7 @@
+/*
+Taken from: https://github.com/gkjohnson/threejs-sandbox/tree/master/conditional-lines
+under MIT license
+ */
 import { Color, ShaderLib, ShaderMaterial, UniformsUtils } from 'three'
 
 export class ColoredShadowMaterial extends ShaderMaterial {
diff --git a/src/extensions/core/load3d/conditional-lines/ConditionalEdgesGeometry.js b/src/extensions/core/load3d/conditional-lines/ConditionalEdgesGeometry.js
index e9237fb805..5b08afc33d 100644
--- a/src/extensions/core/load3d/conditional-lines/ConditionalEdgesGeometry.js
+++ b/src/extensions/core/load3d/conditional-lines/ConditionalEdgesGeometry.js
@@ -1,3 +1,7 @@
+/*
+Taken from: https://github.com/gkjohnson/threejs-sandbox/tree/master/conditional-lines
+under MIT license
+ */
 import { BufferAttribute, BufferGeometry, Triangle, Vector3 } from 'three'
 
 const vec0 = new Vector3()
diff --git a/src/extensions/core/load3d/conditional-lines/ConditionalEdgesShader.js b/src/extensions/core/load3d/conditional-lines/ConditionalEdgesShader.js
index 18fc54108f..f5ca16f937 100644
--- a/src/extensions/core/load3d/conditional-lines/ConditionalEdgesShader.js
+++ b/src/extensions/core/load3d/conditional-lines/ConditionalEdgesShader.js
@@ -1,3 +1,7 @@
+/*
+Taken from: https://github.com/gkjohnson/threejs-sandbox/tree/master/conditional-lines
+under MIT license
+ */
 import { Color } from 'three'
 
 export const ConditionalEdgesShader = {
diff --git a/src/extensions/core/load3d/conditional-lines/Lines2/ConditionalLineMaterial.js b/src/extensions/core/load3d/conditional-lines/Lines2/ConditionalLineMaterial.js
index 1c9637dfe5..8b14735267 100644
--- a/src/extensions/core/load3d/conditional-lines/Lines2/ConditionalLineMaterial.js
+++ b/src/extensions/core/load3d/conditional-lines/Lines2/ConditionalLineMaterial.js
@@ -1,3 +1,7 @@
+/*
+Taken from: https://github.com/gkjohnson/threejs-sandbox/tree/master/conditional-lines
+under MIT license
+ */
 import { ShaderMaterial, UniformsLib, UniformsUtils, Vector2 } from 'three'
 import { LineMaterial } from 'three/examples/jsm/lines/LineMaterial'
 
diff --git a/src/extensions/core/load3d/conditional-lines/Lines2/ConditionalLineSegmentsGeometry.js b/src/extensions/core/load3d/conditional-lines/Lines2/ConditionalLineSegmentsGeometry.js
index 4470ead6c4..74e1480038 100644
--- a/src/extensions/core/load3d/conditional-lines/Lines2/ConditionalLineSegmentsGeometry.js
+++ b/src/extensions/core/load3d/conditional-lines/Lines2/ConditionalLineSegmentsGeometry.js
@@ -1,3 +1,7 @@
+/*
+Taken from: https://github.com/gkjohnson/threejs-sandbox/tree/master/conditional-lines
+under MIT license
+ */
 import * as THREE from 'three'
 import { LineSegmentsGeometry } from 'three/examples/jsm/lines/LineSegmentsGeometry.js'
 
diff --git a/src/extensions/core/load3d/conditional-lines/OutsideEdgesGeometry.js b/src/extensions/core/load3d/conditional-lines/OutsideEdgesGeometry.js
index 8c52309ca9..19099c8294 100644
--- a/src/extensions/core/load3d/conditional-lines/OutsideEdgesGeometry.js
+++ b/src/extensions/core/load3d/conditional-lines/OutsideEdgesGeometry.js
@@ -1,3 +1,7 @@
+/*
+Taken from: https://github.com/gkjohnson/threejs-sandbox/tree/master/conditional-lines
+under MIT license
+ */
 import { BufferAttribute, BufferGeometry, Vector3 } from 'three'
 
 const vec = new Vector3()