We require all commits to SymbiFlow projects to have the Developer Certificate of Origin explicitly acknowledged. This is done through adding a Signed-off-by: Tim 'mithro' Ansell <me@mith.ro> line to the bottom of each commit message.

You can do this easily with git via the git commit --amend --signoff and git rebase --signoff commands.

There is more information about this at;

• https://stackoverflow.com/questions/1962094/what-is-the-sign-off-feature-in-git-for
• https://github.com/probot/dco
• https://cert-manager.io/docs/contributing/sign-off/