Update index.md

en/documentation/installation/index.md

@@ -339,6 +339,11 @@ from source.
 {: #mise-en-place}
 
 [mise-en-place][mise-en-place] allows you to switch between multiple Rubies.
+It uses [ruby-build](#ruby-build) under the hood but can also be configured to use [ruby-install](#ruby-install)
+—neither of which needs to be manually installed first. mise-en-place is a polyglot
+version manager supporting many programming languages including [ruby][mise-en-place-ruby].
+mise-en-place also has a [gem backend](https://mise.jdx.dev/dev-tools/backends/gem.html) which can be used to manage
+versions of CLIs written in ruby.
 It supports UNIX-like and Windows operating systems.
 
 
@@ -430,4 +435,5 @@ though, because the installed Ruby won't be managed by any tools.
 [asdf-vm]: https://asdf-vm.com/
 [asdf-ruby]: https://github.com/asdf-vm/asdf-ruby
 [mise-en-place]: https://mise.jdx.dev
+[mise-en-place-ruby]: https://mise.jdx.dev/lang/ruby.html
 [openbsd-current-ruby-ports]: https://cvsweb.openbsd.org/cgi-bin/cvsweb/ports/lang/ruby/?only_with_tag=HEAD