> For the complete documentation index, see [llms.txt](https://mastodon.gitbook.io/mastodon/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mastodon.gitbook.io/mastodon/admin/optional.md).

# Installing optional features

- [Full-text search](https://mastodon.gitbook.io/mastodon/admin/optional/elasticsearch.md)
- [Hidden services](https://mastodon.gitbook.io/mastodon/admin/optional/tor.md)
- [Single Sign On (SSO, LDAP, PAM, CAS, SAML)](https://mastodon.gitbook.io/mastodon/admin/optional/sso.md)