From cdf130f32895f4fedd49f742d49b17c2baa791ac Mon Sep 17 00:00:00 2001
From: Megan Wachs
Date: Mon, 1 Nov 2021 21:54:26 -0700
Subject: Update CONTRIBUTING.md (#2219)

---
 CONTRIBUTING.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 5f55ac52..06b5200f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -12,3 +12,5 @@
 
 5. You can peruse the [good-first-issues](https://github.com/chipsalliance/chisel3/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22) for easy tasks to start with. Another easy thing to start with is doing your own pass of the [website](https://www.chisel-lang.org/chisel3/docs/introduction.html) looking for typos, pages missing their titles, etc. The sources for the website are [here](https://github.com/chipsalliance/chisel3/tree/master/docs).
 
+6. Please make your PRs against the `master` branch. The project admins, when reviewing your PR, will decide which stable version (if any) your change should be backported to. The backports will be opened automatically on your behalf and you may need to do some cleanup, but focus first on your `master` PR.
+
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