diff --git a/docs/impl/reports/SIM7600-SETUP.md b/docs/impl/reports/SIM7600-SETUP.md
index 57b0f40..10a56d5 100644
--- a/docs/impl/reports/SIM7600-SETUP.md
+++ b/docs/impl/reports/SIM7600-SETUP.md
@@ -93,6 +93,8 @@ sudo nmcli con add type gsm ifname '*' con-name povo gsm.apn povo.jp \
 ```
 
 - `ifname '*'`: binds to whichever modem ModemManager exposes (now `cdc-wdm0`).
+- `connection.metered yes` (added 2026-10-08): marks LTE as metered so bulk transfers can refuse it. Project Yukart's
+  map-tile sync uses this as its second guard (LAN-only rsync).
 - `autoconnect-retries 0` (forever): the default of 4 retries left the link permanently down after early failures. In a car, the modem may
   come up after NetworkManager.
 - Metric 1000 vs NM defaults Ethernet 100 / WiFi 600 → LTE only carries traffic when both are gone. Right after connecting the route