diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ec061a9..483c36b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -6,11 +6,11 @@ I welcome pull requests. But accepting a PR obligates me to maintain that code f
 
 * PRs for simple documentation fixes (e.g., spelling and grammar corrections) are always welcome. For more substantial changes, I don’t necessarily prefer PRs to issues or feature requests. A good description of the problem with a working example is better than a half-baked PR. I can often fix it in less time than it would take to review the PR. (= Principle of Efficiency)
 
-* If you want feedback on a potential PR, I recommend posting to the [Pollen mailing list](http://groups.google.com/forum/#!forum/pollenpub) rather than here. Because more people will see it. (= Principle of Exposure)
+* If you want feedback on a potential PR, I recommend posting to the [Pollen discussion area](https://github.com/mbutterick/pollen-users) rather than here. Because more people will see it. (= Principle of Exposure)
 
 * Small PRs are easier to accept than large ones. Large PRs should have a benefit worthy of their complexity. PRs that want to amend Pollen’s public interface receive the highest scrutiny. (= Principle of Proportionality)
 
-* I consider every PR, but I can’t promise detailed code reviews or comments. Helpful Racketeers can be found on the [Pollen mailing list](http://groups.google.com/forum/#!forum/pollenpub), the [Racket mailing list](https://lists.racket-lang.org/), and the Racket [Slack channel](https://racket.slack.com/). (= Principle of Specialization)
+* I consider every PR, but I can’t promise detailed code reviews or comments. Helpful Racketeers can be found on the [Pollen discussion area](https://github.com/mbutterick/pollen-users), the [Racket mailing list](https://lists.racket-lang.org/), and the Racket [Slack channel](https://racket.slack.com/). (= Principle of Specialization)
 
 * PRs should be necessary, in the sense that the proposed change can only be accomplished by patching this repo. (Corollary:  features that can live in a separate [package](https://pkgs.racket-lang.org/) probably should.) (= Principle of Necessity)