diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 32f7492b..b2df0e21 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -47,7 +47,8 @@ you'll learn.
Communication about Rust Bitcoin happens primarily in
[#bitcoin-rust](https://web.libera.chat/?channel=#bitcoin-rust) IRC chat on
[Libera](https://libera.chat/) with the logs available at
-.
+ (starting from Jun 2021 and now on) and
+ (historical archive before Jun 2021).
Discussion about code base improvements happens in GitHub issues and on pull
requests.