add section about DCO to CONTRIBUTING.md (#210)

Signed-off-by: Dirk Thomas <[email protected]>
ros2 · Mar 20, 2019 · bca18dd · bca18dd
1 parent 9ea0672
commit bca18dd
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -11,3 +11,8 @@ be under the Apache 2 License, as dictated by that
    the terms of any separate license agreement you may have executed
    with Licensor regarding such Contributions.
 ~~~
+
+Contributors must sign-off each commit by adding a `Signed-off-by: ...`
+line to commit messages to certify that they have the right to submit
+the code they are contributing to the project according to the
+[Developer Certificate of Origin (DCO)](https://developercertificate.org/).