diff --git a/src/shaders/DiscardShader.js b/src/shaders/DiscardShader.js
index f7bffd32..76cbfb0f 100644
--- a/src/shaders/DiscardShader.js
+++ b/src/shaders/DiscardShader.js
@@ -1,3 +1,5 @@
+// Based on https://github.com/pmndrs/drei/blob/master/src/materials/DiscardMaterial.tsx
+
 export const vertexShader = /* glsl */ `
 in vec3 position;