> For the complete documentation index, see [llms.txt](https://docs.zipy.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zipy.ai/configure/session-stitching-rootdomain.md).

# Session Stitching (rootDomain)

Using this parameter, you can specify whether or not sessions between the subdomains of your site should be split up into individual sessions for each subdomain. Set this to the highest level hostname that sessions should be shared over ((e.g. example.com or shared.example.com). If you want a distinct session for each subdomain, leave it unspecified.

```javascript
window.zipy.init('YOUR_PROJECT_SDK_KEY', {
   rootDomain: 'example.com'
});
```