Adding more details on how to submit a change.
Change-Id: I5335737f3c2f1bc43a3a0ee3d1988dc9a0197cc5
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 579b8ad..1efa7e5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -24,7 +24,31 @@
All submissions, including submissions by project members, require review. We
use [Gerrit](https://hafnium-review.googlesource.com) for this purpose.
+To submit a change:
+
+1. Create an account in the
+ [Gerrit UI](https://hafnium-review.googlesource.com).
+2. Follow the [getting started](docs/GettingStarted.md) instructions to clone
+ the Hafnium repositories and set up the necessary commit hook.
+3. Make your change.
+4. Run our autoformatter with `make format`.
+5. Commit as usual. If you make a change in a submodule you will also need to
+ commit a change in the main repository to update the submodule version.
+6. Run the [tests](docs/Testing.md) and other presubmit checks with
+ `kokoro/ubuntu/build.sh`, ensure they all pass.
+7. Upload the change to Gerrit with `git push origin HEAD:refs/for/master`. If
+ you have changed submodules then you'll need to push them as well.
+8. If you changed submodules, then add a matching 'topic' from the Gerrit UI
+ for all your changes (submodules and the main repository) so that they can
+ be reviewed and submitted together.
+9. Wait 10-15 minutes for our presubmit tests to run, and make sure a 'Kokoro
+ +1' comment shows up in Gerrit indicating that they have passed. If not,
+ follow the links to find the errors, fix them and try again.
+10. From the Gerrit UI add one or more reviewers. Looking at who has modified
+ the same files frequently recently is usually a good way to pick a reviewer,
+ but if you're not sure then you can add hafnium-team@google.com.
+
## Community Guidelines
-This project follows [Google's Open Source Community
-Guidelines](https://opensource.google.com/conduct/).
+This project follows
+[Google's Open Source Community Guidelines](https://opensource.google.com/conduct/).
