diff --git a/README.md b/README.md
index 1563e07..2e6dd5f 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,10 @@
 [![License: GPL-3.0-or-later](https://img.shields.io/badge/license-GPL--3.0--or--later-blue)](LICENSE)
 [![Docs: docs.ihasmail.org](https://img.shields.io/badge/docs-docs.ihasmail.org-0ea5e9)](https://docs.ihasmail.org/install/stalwart-migrator/)
 
+> [!NOTE]
+> Development happens on [git.coffeylabs.org/coffey-labs/stalwart-migrator](https://git.coffeylabs.org/coffey-labs/stalwart-migrator); the copy on GitHub is a read-only mirror.
+> Report issues at **[git.coffeylabs.org/coffey-labs/stalwart-migrator/issues](https://git.coffeylabs.org/coffey-labs/stalwart-migrator/issues)**, and join discussions at **[community.coffeylabs.org](https://community.coffeylabs.org)**.
+
 In-place upgrade tool for Stalwart Mail Server, 0.15.5 → 0.16: no data loss, a
 checkpoint at every step so an interrupted run resumes instead of restarting,
 and automated validation that the server still works afterwards. Go, standard