Add deprecation notice
Change-Id: I4293a47d563cb32627a2254a1632c8e333ac8c11
diff --git a/README.md b/README.md
index 876d49b..96e1dca 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,11 @@
-# Gerrit Zookeeper ref-db
+# DEPRECATION NOTICE
+
+GerritForge has decided to [change the license to BSL](https://gitenterprise.me/2025/09/30/re-licensing-gerritforge-plugins-welcome-to-gerrit-enterprise/)
+therefore the Apache 2.0 version of this plugin is deprecated.
+The recommended version of the zookeeper-refdb plugin is on [GitHub](https://github.com/GerritForge/zookeeper-refdb)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/zookeeper-refdb,general).
+
+# Gerrit Zookeeper ref-db (DEPRECATED)
This plugin provides an implementation of the Gerrit global ref-db backed by
[Apache Zookeeper](https://zookeeper.apache.org/).
