Analogous to adding base layers, custom overlays can be added in
the `config.js` file:
```javascript
BR.conf.overlays = {
'Hill shading': 'http://{s}.tiles.wmflabs.org/hillshading/{z}/{x}/{y}.png'
};
```
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|---|---|---|
| .. | ||
| control | ||
| plugin | ||
| router | ||
| index.js | ||
| Util.js | ||