diff --git a/docs/data-model-alignment-v1.md b/docs/data-model-alignment-v1.md
index 3462bc0..cf30523 100644
--- a/docs/data-model-alignment-v1.md
+++ b/docs/data-model-alignment-v1.md
@@ -897,9 +897,12 @@ Arbitrary nested JSON survives intact. The example above stores
 `raw->speaker_name_agreements` as `{"dealhunter": [61, 64, 97], "last_dwarf": [93, 68, 71]}` —
 checked, not assumed.
 
-**Transport note.** Use the hostname and no `Host` header is needed. If you reach the
-controller by IP address instead, you must send `Host: umbratrans.bdmurphy.me` or every
-request returns `400` — including `/api/health`, which makes a healthy service look dead.
+**Transport note.** Use `http://192.168.123.14:8442` directly. Both that address and
+`umbratrans.bdmurphy.me` are accepted Host values as of 2026-10-03; before then the
+service bound to `192.168.123.14` while rejecting requests to it, so *every* request by
+IP returned `400 Invalid host header` — including `/api/health`, which makes a healthy
+service look dead. If you see a bare `400` with no JSON body, suspect the Host header
+before anything else.
 
 ### 10.7 What the response tells you