Updated Defining custom shaders (markdown)

Defining-custom-shaders.md

@@ -44,6 +44,7 @@ An example of a typical texture pack shader configuration is shown below:
         biomeshaded: true
         swampshaded: true
         waterbiomeshaded: true
+        better-grass: false
 
 The settings for the TexturePackHDShader include:
 
@@ -57,6 +58,8 @@ The settings for the TexturePackHDShader include:
 
 - _waterbiomeshaded_ : This setting controls whether water is toned based on biome temperature and rainfall data.  The default is based on the _waterbiomeshaded_ attribute in **configuration.txt** (which defaults to true for 1.9.0 and later, false for 1.8.x).
 
+- _better-grass_ : This setting controls the option to render the sides of grass and snow blocks as done by the BetterGrass client mod.  If not defined, the value for _better-grass_ set in **configuration.txt** applies (which defaults to false).
+
 An example of a typical topological shader configuration is shown below:
 
     shaders: