service/documentation.md

@@ -408,10 +408,14 @@ Staff hours, hosting costs shadowed by GitLab.
  * [hugo](https://gohugo.io/): golang
  * [ikiwiki][]: previously used, old, Perl, hard to setup, occult   templating system, slow
  * [lektor](https://www.getlektor.com/): used at Tor for other public websites
+ * [Mkdocs](https://www.mkdocs.org/): also supported by [Read the docs](https://readthedocs.org/), similar to
+   Sphinx, but uses Markdown instead of RST
  * [Nanoc][]: [used by GitLab](https://docs.gitlab.com/ee/development/documentation/site_architecture/index.html)
  * [pelican](https://getpelican.com/): watch out for pelican, another user reports that,
    with caching, generating a 500 page site takes 30 seconds, 2
    minutes without caching
+ * [Sphinx](https://www.sphinx-doc.org/): used by [Read the docs](https://readthedocs.org/), enforces more structure
+   and more formal (if less familiar) markup (ReStructured Text, RST)
  * [zola](https://www.getzola.org/): rust
 
 [Nanoc]: https://nanoc.ws/