diff --git a/src/utils/postprocessing/README.md b/src/utils/postprocessing/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..1385db1d2b5b53f0325fe39020b0de2f4d91144d
--- /dev/null
+++ b/src/utils/postprocessing/README.md
@@ -0,0 +1,7 @@
+These files
+- EffectComposer.js
+- MaskPass.js
+- RenderPass.js
+- ShaderPass.js
+are copied from https://github.com/mrdoob/three.js/blob/dev/examples/js/postprocessing/EffectComposer.js
+
diff --git a/src/utils/shaders/README.md b/src/utils/shaders/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..6d4b23f4a3954768617953bbea2a897ded60ded5
--- /dev/null
+++ b/src/utils/shaders/README.md
@@ -0,0 +1,5 @@
+These files
+- CopyShader.js
+- VignetteShader.js
+were copied from https://github.com/mrdoob/three.js/blob/dev/examples/js/shaders/CopyShader.js
+