From b2e4fb6deb4b67f20dc91e7fff17b2ab69cc4738 Mon Sep 17 00:00:00 2001
From: Sean Lilley <lilleyse@gmail.com>
Date: Fri, 11 Aug 2017 12:01:23 -0400
Subject: [PATCH] Add doc

---
 lib/loadMtl.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/loadMtl.js b/lib/loadMtl.js
index 62a58ed..bc10fba 100644
--- a/lib/loadMtl.js
+++ b/lib/loadMtl.js
@@ -17,6 +17,11 @@ module.exports = loadMtl;
 /**
  * Parse a .mtl file and load textures referenced within. Returns an array of glTF materials with Texture
  * objects stored in the texture slots.
+ * <p>
+ * Packed PBR textures (like metallicRoughnessOcclusion and specularGlossiness) require all input textures to be decoded before hand.
+ * If a texture is of an unsupported format like .gif or .tga it can't be packed and a metallicRoughness texture will not be created.
+ * Similarly if a texture cannot be found it will be ignored and a default value will be used instead.
+ * </p>
  *
  * @param {String} mtlPath Path to the .mtl file.
  * @param {Object} options The options object passed along from lib/obj2gltf.js