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Change-Id: I4e1ed0aaddf4dc516a81155ef62dba138f8495ae
Reviewed-by: Adam Langley <>
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+Want to contribute? Great! First, read this page (including the small print at the end).
+### Before you contribute
+Before we can use your code, you must sign the
+[Google Individual Contributor License Agreement](
+(CLA), which you can do online. The CLA is necessary mainly because you own the
+copyright to your changes, even after your contribution becomes part of our
+codebase, so we need your permission to use and distribute your code. We also
+need to be sure of various other things—for instance that you'll tell us if you
+know that your code infringes on other people's patents. You don't have to sign
+the CLA until after you've submitted your code for review and a member has
+approved it, but you must do it before we can put your code into our codebase.
+Before you start working on a larger contribution, you should get in touch with
+us first via email with your idea so that we can help out and possibly guide
+you. Coordinating up front makes it much easier to avoid frustration later on.
+### Code reviews
+All submissions, including submissions by project members, require review. We
+use [Gerrit]( for this purpose.
+#### Setup
+If you have not done so on this machine, you will need to set up a password for
+Gerrit. Sign in with a Google account, visit
+[this link](, and click the "Generate
+Password" link in the top right. You will also need to prepare your checkout to
+[add Change-Ids](
+on commit. Run:
+    curl -Lo .git/hooks/commit-msg
+    chmod u+x .git/hooks/commit-msg
+#### Uploading changes
+To upload a change, push it to the special `refs/for/master` target:
+    git push origin HEAD:refs/for/master
+The output will then give you a link to the change. Add `` and
+`` as reviewers.
+Pushing a commit with the same Change-Id as an existing change will upload a new
+version of it. (Use the `git rebase` or `git commit --amend` commands.)
+For more detailed instructions, see the
+[Gerrit User Guide](
+### The small print
+Contributions made by corporations are covered by a different agreement than
+the one above, the
+[Software Grant and Corporate Contributor License Agreement](