Update README.md

README.md

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 # Surfaces
 Surfaces is an open-source sample app from Microsoft's Mixed Reality Design Labs. It demonstrates how to use **[Mixed Reality Toolkit(MRTK)](https://github.com/Microsoft/MixedRealityToolkit-Unity)**'s input system and building blocks to create an app experience for HoloLens 2. In this project, you can find the examples of:
-- Use MRTK's **[Input System](https://microsoft.github.io/MixedRealityToolkit-Unity/Documentation/Input/Overview.html)**
-- Create objects that respond to the standard inputs using **MRTK's [Interactable](https://microsoft.github.io/MixedRealityToolkit-Unity/Documentation/README_Interactable.html)**. 
-- **MRTK [Button](https://microsoft.github.io/MixedRealityToolkit-Unity/Documentation/README_Button.html)**
+- Use MRTK's **[Input System](https://microsoft.github.io/MixedRealityToolkit-Unity/Documentation/Input/Overview.html)**, specifically hand / joint tracking.
+- Use MRTK's **[Standard Shader](https://microsoft.github.io/MixedRealityToolkit-Unity/Documentation/README_MRTKStandardShader.html)** for performant graphics.
 
 You can use this project's components to create your own mixed reality app experiences.