README.md in trackler-1.0.1.1 vs README.md in trackler-1.0.1.2

@@ -62,10 +62,20 @@
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
 
-To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+To install this gem onto your local machine, run `bundle exec rake install`.
+
+To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+
+## Adding a new language track
+
+Language tracks are included as submodules. To add a new one, run the following command, defining the track id as an environment variable. Shown here with `prolog` as an example.
+
+```
+$ TRACK_ID=prolog; git submodule add https://github.com/exercism/x$TRACK_ID tracks/$TRACK_ID
+```
 
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/exercism/trackler. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.