Add channel note to aoMap.

docs/api/materials/MeshStandardMaterial.html

@@ -97,7 +97,7 @@
 		</div>
 
 		<h3>[property:Texture aoMap]</h3>
-		<div>The ambient occlusion map. Default is null.</div>
+		<div>The red channel of this texture is used as the ambient occlusion map. Default is null.</div>
 
 		<h3>[property:Float aoMapIntensity]</h3>
 		<div>Intensity of the ambient occlusion effect. Default is 1. Zero is no occlusion effect.</div>