symon monitor pf?

http://wpd.home.xs4all.nl/symon/documentation.html

Installation notes
==================

Privileges
==========
symux needs read and write access to its rrdfiles.

symon needs to interface with your kernel. Depending on your host system this
leads to different privilege requirements:

OpenBSD:  - no privs: cpu, debug, df, if, io, mbuf, mem, proc, sensor
          - rw on /dev/pf for pf

now I want to monitor pf, so we must grant user(_symon) rw Privileges to 
/dev/pf?
why need write Privilege? only read Privilege may work?

Will you suggest a workaround?

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