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+.TH HWCLOCK 5 "Dec 2020" "" "Debian Administrator's Manual"
+.SH NAME
+hwclock \- settings that affect the behaviour of the hwclock init script
+.SH DESCRIPTION
+The
+.I /etc/default/hwclock
+file contains settings in POSIX format:
+.IP "" .5i
+VAR=VAL
+.PP
+Only one assignment is allowed per line.
+Comments (starting with '#') are also allowed.
+
+.SH SETTINGS
+The following settings can be set.
+
+.IP \fBHCTOSYS_DEVICE\fP
+The hardware clock device you want to use.  Defaults to \fBrtc0\fP.
+It should probably match the CONFIG_RTC_HCTOSYS_DEVICE kernel config
+option.
+
+If you change this, you also need to install a custom udev rule,
+mirroring \fB/usr/lib/udev/rules.d/85-hwclock.rules\fP. Otherwise,
+the hardware clock device will be ignored during boot.
+
+On almost all systems, this should not be changed.
+
+.SH NOTES
+
+On systems using systemd as init, the hwclock init script is ignored.
+
+.SH SEE ALSO
+.BR hwclock (8),
+.BR systemd-timesyncd.service (8)