Enhance explanation in kokoro/README.md. (#8253)
diff --git a/kokoro/README.md b/kokoro/README.md
index 0791c92..590d7bd 100644
--- a/kokoro/README.md
+++ b/kokoro/README.md
@@ -3,4 +3,10 @@
----------------------
The files in this directory serve as plumbing for running Protobuf
-tests under Kokoro, our internal CI.
\ No newline at end of file
+tests under Kokoro, our internal CI.
+
+We have shared this part of our CI configuration in hopes that it is
+helpful to contributors who want to better understand the details of
+our test and release processes. If there are changes, please file an
+issue; unfortunately, we may not be able to accept PRs (but feel free
+to send one if it helps to explain the issue).
