Add document for `TinyGLTF::SetPreserveimageChannels`.
diff --git a/README.md b/README.md
index 830ef29..bcf53fd 100644
--- a/README.md
+++ b/README.md
@@ -155,6 +155,10 @@
}
```
+#### Loader options
+
+* `TinyGLTF::SetPreserveimageChannels(bool onoff)`. `true` to preserve image channels as stored in image file for loaded image. `false` by default for backward compatibility(image channels are widen to `RGBA` 4 channels). Effective only when using builtin image loader(STB image loader).
+
## Compile options
* `TINYGLTF_NOEXCEPTION` : Disable C++ exception in JSON parsing. You can use `-fno-exceptions` or by defining the symbol `JSON_NOEXCEPTION` and `TINYGLTF_NOEXCEPTION` to fully remove C++ exception codes when compiling TinyGLTF.