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+Pi-hole enforces the [Developer Certificate of Origin](https://developercertificate.org/) (DCO) on Pull Requests. It requires all commit messages to contain the `Signed-off-by` line with an email address that matches the commit author.
+
+The Developer Certificate of Origin (DCO) is a lightweight way for contributors to certify that they wrote or otherwise have the right to submit the code they are contributing to the project. Here is the full [text of the DCO](https://developercertificate.org/), reformatted for readability:
+
+
+>  
+> By making a contribution to this project, I certify that:
+>
+> 1. The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file; or
+>
+> 2. The contribution is based upon previous work that, to the best of my knowledge, is covered under an > appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or
+>
+> 3. The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it.
+>
+> 4. I understand and agree that this project and the contribution are public and that a record of the contribution (including all personal information I submit with it, including my sign-off) is maintained indefinitely and may be redistributed consistent with this project or the open source license(s) involved.
+
+Contributors _sign-off_ that they adhere to these requirements by adding a `Signed-off-by` line to commit messages.
+
+```
+This is my commit message
+
+Signed-off-by: Random J Developer <random@developer.example.org>
+```
+Git even has a `-s` command line option to append this automatically to your commit message:
+
+`$ git commit -s -m 'This is my commit message'`
+
+![DCO Failed PR](https://cloud.githubusercontent.com/assets/173/24482273/a35dc23e-14b5-11e7-9371-fd241873e2c3.png)