diff --git a/docs/impl/reports/DEVICE-NAMING.md b/docs/impl/reports/DEVICE-NAMING.md
index 9659b38..d5e7a07 100644
--- a/docs/impl/reports/DEVICE-NAMING.md
+++ b/docs/impl/reports/DEVICE-NAMING.md
@@ -24,7 +24,11 @@ can point at a different device after a reboot or replug.
 | SIM7600 data | NetworkManager `povo` connection with `ifname '*'` | n/a, follows whatever modem ModemManager exposes |
 
 `can_onboard` was verified with a live rename (`mttcan c310000.mttcan can_onboard: renamed from can0`).
-`can_pcan` was checked against the driver source only, because the adapter wasn't plugged in. **To do:** plug the adapter in and confirm with `ip -br link`.
+
+**Verified across a cold boot (2026-10-08)** with the PCAN-USB and SIM7600 both attached before power-on: `pcan` registered *first*
+and took `can0`, which is the race this rule exists for. udev renamed it (`pcan 1-2.4:1.0 can_pcan: renamed from can0`), and
+`mttcan` then got `can0` and was renamed to `can_onboard`. ModemManager came up on `cdc-wdm0` (qmi_wwan auto-loaded), `povo`
+auto-connected with `wwan0` at metric 1000 below WiFi, and gpsd started on `/dev/sim7600-gps`.
 
 ## CAN: `/etc/udev/rules.d/70-can-names.rules`