diff --git a/ap/99-van-router.conf b/ap/99-van-router.conf
index 5737226..8d1cbf3 100644
--- a/ap/99-van-router.conf
+++ b/ap/99-van-router.conf
@@ -1,12 +1,11 @@
 net.ipv4.ip_forward=1
 
 # Ubuntu ships /usr/lib/sysctl.d/55-ipv6-privacy.conf with use_tempaddr=2
-# (prefer rotating privacy addresses) system-wide. That default fought the
-# WAN uplinks' need for one stable IPv6 source address per interface (hbc,
-# DNS, van-failover all key off it) — a long-lived flow using a source
-# address that later got deprecated mid-flight looked like random upstream
-# packet loss and cost a day of packet-capture debugging (2026-07-12/13)
-# before the cause turned out to be this file loading before ours. 99- beats
-# 55- lexically so this wins the second `sysctl --system` re-reads it.
+# (prefer rotating privacy addresses) system-wide. The WAN uplinks need one
+# stable IPv6 source per interface: address churn at boot (this default plus
+# the dracut networkd catch-all deploy.sh masks) poisoned upstream per-flow
+# state for long-lived UDP flows created mid-churn — see the 2026-07-12/13
+# "wan IPv6 overdue" investigation. 99- beats 55- lexically so this wins
+# when `sysctl --system` runs.
 net.ipv6.conf.all.use_tempaddr=0
 net.ipv6.conf.default.use_tempaddr=0