Update README.md

spine-turbulenz/README.md

@@ -14,3 +14,7 @@ To run the example:
 
 - [spine-turbulenz Demo](http://esotericsoftware.com/spine/files/demos/turbulenz/example/index.html)
   [spine-turbulenz Demo source](https://github.com/EsotericSoftware/spine-runtimes/blob/master/spine-turbulenz/example/index.html#L21)
+
+## Notes
+
+- Atlas images should not use premultiplied alpha or rotation.