service/documentation.md

@@ -530,6 +530,10 @@ GitLab wikis.
  * [linkchecker](https://github.com/linkchecker/linkchecker/): can check links in HTML (anarcat is one of the
    maintainers), has many alternatives, see for example [lychee](https://github.com/lycheeverse/lychee)
 
+Note that we currently use [markdownlint][] (the Ruby version, not the
+Nodejs one, because anarcat dislikes nodejs more than Ruby), but we
+could expand this to cover more things.
+
 See also [this LWN article](https://lwn.net/Articles/822969/).
 
 [vale]: https://errata-ai.gitbook.io/vale/