-You can use Arvbox as a self-contained Arvados development environment using
-`arvbox start dev` and run the Arvados test suite with `arvbox start test`.
-See http://doc.arvados.org/install/arvbox.html for details.
+Instructions for setting up a development environment and working on specific
+components can be found on the
+["Hacking Arvados" page of the Arvados wiki](https://dev.arvados.org/projects/arvados/wiki/Hacking).
+
+## Contributing
+
+When making a pull request, please ensure *every git commit message* includes a one-line [Developer Certificate of Origin](https://dev.arvados.org/projects/arvados/wiki/Developer_Certificate_Of_Origin). If you have already made commits without it, fix them with `git commit --amend` or `git rebase`.