In order to make the Public Suffix List (PSL) as current and accurate as possible, we request that Top-Level Domain (TLD) registries put in place processes to keep their section of the list current and accurate. This will make sure that all sites within their TLD continue to function fully within modern browsers, in terms of the site owners' ability to set cookies, request certificates and so on.
In addition, owners of privately-registered domains who themselves issue subdomains to mutually-untrusting parties may wish to be added to the PRIVATE section of the list.
The procedure to make changes is via submitting pull-requests on GitHub, and that process, acceptance criteria, formatting and structure, etc. are documented on our wiki.
Requests for changes to the PRIVATE section MUST come from the domain owner - we have this verification rule to ensure that domain owners are fully aware of the addition or change and understand the consequences and impacts of a domain being added to the list. We will not make additions to this section if they are requested by third parties. We will generally decline small projects or expirimental / lab requests or short term entries. The PSL is not intended to be any indication of security or trust, nor should projects, companies, corporations or advertising firms direct their users to submit PSL requests to bypass rate limits or internet user protections from tracking. Requests for changes to the ICANN section either need to come from the registry, ICANN or the IANA and be provided with links to supporting official documentation.