diff --git a/content/u/products/hosted-support-system/contents.lr b/content/u/products/hosted-support-system/contents.lr
index ec456ce..94841ec 100644
--- a/content/u/products/hosted-support-system/contents.lr
+++ b/content/u/products/hosted-support-system/contents.lr
@@ -60,8 +60,20 @@ their tickets.
 ## Fully Open Source and IPv6 enabled
 
 As with all our offers the support system is completely based on Open
-Source Software components. From the operating system to the
+Source Software components. From the operating system to the software
+stack, nothing is closed. We are using
 
+* [Alpine Linux](https://alpinelinux.org/)
+* [PostgreSQL](https://www.postgresql.org/)
+* [cdist](https://cdi.st)
+* [RT](https://bestpractical.com/request-tracker) from Best Practical
+
+as the technology stack.
+
+## Zero Carbon
+
+As always, the hosted support system is running in our Zero Carbon
+Data Center.
 
 ## How to order