diff --git a/README.md b/README.md
index 36d2aea..cd308fe 100644
--- a/README.md
+++ b/README.md
@@ -316,6 +316,10 @@ graphify-build.sh /path/to/project  # uses graphify if available, falls back to
 - Python 3.8+ (stdlib only, no pip packages)
 - Linux or macOS
 
+## Part of AgentStack
+
+This tool is free and always will be. For teams that need the full governance stack (GuardRail Pro + Compliance Shield + priority support), see [AgentStack Pro](https://github.com/FvdHMBAI/agent-stack/blob/main/BUNDLE.md) (EUR 79/dev/month).
+
 ## License
 
 [MIT](LICENSE)