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Choosing a subdomain

Please follow the steps to set a custom domain in this order:
Only subdomains can be used to serve your GitBook documentation. It's not possible to use an apex domain.
Here are some examples of what you could and could not choose — just replace example.com with your own domain:
Domain type
Example
Supported?
Apex domain
example.com
www subdomain
www.example.com
Custom subdomain
docs.example.com
help.example.com anything.example.com
Once you have chosen your custom domain, you're ready to move onto the next step: deciding where to set the custom domain.