README update.

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-Clunk might one day be a program for driving an impulse electric clock
-from a GPIO line.
+Clunk is a program for driving an impulse electric clock from a GPIO
+line.
 
-The general plan is to generate a pulse every 30 s (at 0 s and 30 s
-past each minute), with extra magic to adjust the clock at startup and
-at the start and end of summer time.
+Clunk generates a pulse every 30 s (at 0 s and 30 s past each minute),
+with extra magic to adjust the clock at startup and at the start and
+end of summer time.
+
+Clunk can safely be run as root, but it can also run with fewer
+privileges as long as it has read-write access to its state file and
+to the configured GPIO device.  The supplied systemd unit file
+demonstrates one way to run it with lower privilege.