diff --git a/hosts/hass.windy.lan.md b/hosts/hass.windy.lan.md
index 8a5a5f7..14b9b32 100644
--- a/hosts/hass.windy.lan.md
+++ b/hosts/hass.windy.lan.md
@@ -109,6 +109,25 @@ getent hosts hass.windy.lan
 
 ## Local patches (custom components)
 
+**`china_southern_power_grid_stat` IPv4 aiohttp (verified 2026-08-14, W1N-102):**
+`/config/custom_components/china_southern_power_grid_stat` was replaced from
+GitHub `windyboy/china_southern_power_grid_stat` `master` (`eb8b174`, W1N-101).
+The live client uses HA `async_get_clientsession(hass, family=socket.AF_INET)`
+and bounded aiohttp timeouts; it no longer uses blocking `requests`. Backup of
+the 2026-02-02 HACS/`requests` tree:
+`china_southern_power_grid_stat.bak-20260814-w1n102`. HACS still tracks
+`CubicPill/china_southern_power_grid_stat` — a HACS update would overwrite this
+fork. This directory is a file copy, not a git clone; do not `git pull` in
+place.
+
+After deploy, Core loaded the new code (15:21:45). `verify_login` failed in ~5s
+with `CSGTransportError` (no executor hang). Home PPPoE IPv4 to CSG is currently
+blackholed: `curl -4 https://95598.csg.cn` from `gw` times out to
+`218.19.148.218`; `curl -6` from `gw` returns 200 via `240e:f9:8060::1:16`.
+HA `end1`/`wlan0` have `ipv6.method: disabled` (W1N-85) and only `fe80`
+addresses, so HA cannot use that IPv6 path. Remote IPv4 to the same A record
+still works. Re-apply after any HACS/`CubicPill` update.
+
 **`tianqi` weather recorder patch (verified 2026-08-13, W1N-75):**
 `/config/custom_components/tianqi/weather.py` has a local patch adding
 `_unrecorded_attributes = frozenset({"hourly_temperature", "hourly_skycon",