diff --git a/etc/iwd/main.conf b/etc/iwd/main.conf
index e82abf26..4cf428a7 100644
--- a/etc/iwd/main.conf
+++ b/etc/iwd/main.conf
@@ -5,6 +5,7 @@
 # local ISP in my ighbourhood is incorrectly advertising DE rathar than FI
 # so Lumina gets it wrong. Luckily FI and DE share regulation judging by
 # https://archive.softwareheritage.org/swh:1:cnt:3f74194de9b0bdcf6052b505067363f17427c28f;origin=https://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git;visit=swh:1:snp:1b8d84b34965cbea94ad57200121527c5ad51616;anchor=swh:1:rev:fe05cc94e070c71486047002fc2edf68f5f2a07a;path=/db.txt
+# To check/refresh regdomain, `iw dev wlan0 scan`
 Country=FI
 # legacy compatibility, at least on Lumina?
 use_default_interface=true