Update README

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diff --git a/Demos/grass_demo.PNG b/Demos/grass_demo.PNG
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+++ b/Demos/grass_demo.PNG
diff --git a/README.md b/README.md
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--- a/README.md
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@@ -9,6 +9,20 @@ Then assign the shader you want (like yum\_food/parallax) to a material.
 
 Please ask setup questions [on the discord](https://discord.gg/YWmCvbCRyn).
 
+## Grass (`yum_food/grass`)
+
+![Grass demo](Demos/grass_demo.PNG)
+
+A simple geometry shader that repeats a tile of grass 16 times and uses a noise texture to apply a wind effect on the geometry.
+
+Right now only the noise texture is configurable.
+
+Measured @ ~3.0 ms per frame at 4k
+
+TODO: add a mask to enable controlling where grass spawns.
+
+See `Shaders/grass/grass_10m_tile.prefab`.
+
 ## Parallax (`yum_food/parallax`)
 
 ![Parallax demo](Demos/parallax_demo.gif)
diff --git a/Shaders/grass/grass_lighting.cginc b/Shaders/grass/grass_lighting.cginc
index b657354..4630f99 100644
--- a/Shaders/grass/grass_lighting.cginc
+++ b/Shaders/grass/grass_lighting.cginc
@@ -181,6 +181,7 @@ float4 effect(inout v2f i, out float depth)
     float3 c = lerp(brown, green, uv_phase);
     albedo = float4(c, 1.0);
   }
+  albedo *= 0.8;
 
   float3 normal = i.normal;
   // Rotate the normals a little to make the blades of grass appear more