Merge pull request #11453 from NNskelly/patch-1

Update MeshStandardMaterial.html

docs/api/materials/MeshStandardMaterial.html

@@ -164,7 +164,11 @@ <h3>[property:Float emissiveIntensity]</h3>
 		<div>Intensity of the emissive light. Modulates the emissive color. Default is 1.</div>
 
 		<h3>[property:TextureCube envMap]</h3>
-		<div>The environment map. Default is null.</div>
+		<div>The environment map. Default is null.  Note that in order for the material roughness 
+		property to correctly blur out the environment map, the shader must have access to mipmaps 
+		of the env texture.  TextureCubes created with default settings are correctly configured; 
+		if adjusting texture parameters manually, ensure minFilter is set to one of the MipMap options, 
+		and that mip maps have not been otherwise forcibly disabled.</div>
 
 		<h3>[property:Float envMapIntensity]</h3>
 		<div>Scales the effect of the environment map by multiplying its color.</div>