diff --git a/docs/digital-factory.md b/docs/digital-factory.md
index 849edf6..4176d67 100644
--- a/docs/digital-factory.md
+++ b/docs/digital-factory.md
@@ -741,6 +741,9 @@ Build onward, part-time at launch; add it to the headcount.
   customer audio may argue for a Bangkok provider instead.
 - Customer portal domain: the plant's brand domain (new zone on ns1/ns2,
   second cert on `web01`) or a name under `cnx.network` for launch.
+  Internal testing has its own domain, `cnxvinyl.lol` (registered
+  2026-10-02 at Porkbun, on Porkbun's nameservers for now); the brand
+  domain decision stays open.
 - Portal availability during a plant WAN outage: accept it (the portal is
   a view of live data) or add a read replica on the fleet side later.
 - Accounting and ERP: out of scope for the application; if an ERP is