* I Think this code is not in accordance with the last line of [How to contribute to three.js guideline](https://github.com/mrdoob/three.js/wiki/How-to-contribute-to-three.js) 

* I Think the code in doc must be:

```js
var size = 10;

var step = 1;

var gridHelper = new THREE.GridHelper( size, step );    

gridHelper.position = new THREE.Vector3( 10, 10, 0 );

gridHelper.rotation = new THREE.Euler( 15, 0, 0 );
```