Updated BasicEffect (markdown)

BasicEffect.md

@@ -47,7 +47,7 @@ This effect requires ``SV_Position``, ``NORMAL`` if lighting is enabled (``Effec
 
 * **SetColorAndAlpha**: Sets the diffuse color of the effect and the alpha (transparency).
 
-* **SetTexture**: Associates a texture shader resource view with the effect.
+* **SetTexture**: Associates a texture shader resource view with the effect. Must have used ``EffectFlags::Texture`` to enable texturing.
 
 # Further reading