Updated BasicEffect (markdown)

BasicEffect.md

@@ -47,11 +47,11 @@ This effect requires ``SV_Position``, ``NORMAL`` if lighting is enabled (``Effec
 
 * **DisableSpecular**: Disables the specular lighting for the effect. Sets the color to black (0,0,0) and power to 1.
 
-* **SetAlpha**: Sets the alpha (transparency) of the effect. Defaults to 1 (fully opaque).
+* **SetAlpha**: Sets the alpha (transparency) of the effect. Defaults to 1 (fully opaque). This value is also used for binning opaque vs. transparent geometry.
 
 * **SetColorAndAlpha**: Sets the diffuse color of the effect and the alpha (transparency).
 
-* **SetTexture**: Associates a texture and sampler descriptor with the effect. Must have used ``EffectFlags::Texture`` to enable texturing.
+* **SetTexture**: Associates a texture and sampler descriptor with the effect. Must have used ``EffectFlags::Texture`` to enable texturing. Can optionally include an alpha channel as well.
 
 > Remember the caller is responsible for setting the correct texture descriptor heap and sampler descriptor heap at render time when the effect is applied via ``SetDescriptorHeaps``. See [[Effects]] for more information.