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+wireless-regdb for Debian
+-------------------------
+
+wireless-regdb provides a machine-readable database of legal
+regulations on radio emissions that affect use of wireless networking.
+The Linux kernel and drivers use this to maintain compliance with
+those regulations.
+
+The database is loaded directly by the kernel (since Linux 4.15, but
+only enabled in the Debian package from 5.5 onward).
+
+If you use a custom kernel built from upstream source, it will only
+trust this database if it is signed by the upstream maintainer of
+wireless-regdb. To use the upstream database and signature instead of
+the Debian version, run:
+
+ update-alternatives --set regulatory.db \
+ /lib/firmware/regulatory.db-upstream
+
+ -- Ben Hutchings <benh@debian.org>, Sat, 22 Jan 2022 16:46:35 +0100