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3 changes: 3 additions & 0 deletions src/connections/sources/custom-domain.md
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Expand Up @@ -59,6 +59,9 @@ To configure Custom Domain:

## FAQ

### Can I set up multiple Custom Domains?
For best practices, Segment recommends using only **one** subdomain (e.g., `mysubdomain.mydomain.com`) per domain. Multiple custom domains for the same source are not supported.

### What sources can I use with Custom Domain?
Custom Domain was largely developed to support JavaScript sources. It helps with comprehensive collection of first-party data from your website when accessed over any platform (desktop, mobile, and more). You can use the subdomain for all other non-JavaScript sources as well, for consistency, but it will have no impact on data collection for those sources.

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