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diff --git a/doc/wireguard.md b/doc/wireguard.md
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+# Wireguard
+
+## Initial setup
+
+```sh
+#!/bin/sh
+
+set -eux
+
+cd -- ../../secrets/files/etc/wireguard
+(umask 077; wg genkey | tee shione.private.key | wg pubkey > shione.public.key)
+# TODO: chmod 0600 all files under files/etc/wireguard.
+# TODO: Update files/etc/wireguard/wg0.conf accordingly.
+cd -- -
+```