Why is Renderer.sortingLayerName is not documented?

I would like to learn how to control the rendering order of procedurally generated meshes when used with Unity 4.3 sprites. From the wonders of IntelliSense I see that there is a property “Renderer.sortingLayerName” but for whatever reason this is not documented.

Is there a particular reason why this property should not be used?

What is the proper way to render procedural meshes between sorting layers?

Hmm, it was documented at one point, or at least it was listed in the docs, but with little or no description.

–Eric