service/documentation.md

@@ -564,7 +564,8 @@ Staff hours, hosting costs shadowed by GitLab.
  * [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
+   Sphinx, but uses Markdown instead of RST, [mike](https://github.com/jimporter/mike) can be used to
+   support multiple versions in GitHub Pages
  * [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