Update CONTRIBUTING.md to recommend applying the appropriate labels
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 49b1941..8b28471 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -83,3 +83,13 @@
Ultimately, the green signal will be provided by our testing infrastructure.
The reviewer will help you if there are test failures that seem not related
to the change you are making.
+* Apply the "release notes: yes" label if the pull request's description should
+ be included in the next release (e.g., any new feature / bug fix).
+ Apply the "release notes: no" label if the pull request's description should
+ not be included in the next release (e.g., refactoring changes that does not
+ change behavior, integration from Google internal, updating tests, etc.).
+* Apply the appropriate language label (e.g., C++, Java, Python, etc.) to the
+ pull request. This will make it easier to identify which languages the pull
+ request affects, allowing us to better identify appropriate reviewer, create
+ a better release note, and make it easier to identify issues in the future.
+
