Arpwatch - update-ethercodes cronjob necessary?

[luckman212]

I just starting playing around with the Arpwatch package.

During the install, the following message is displayed:

>>> Installing pfSense-pkg-arpwatch... 
[...blah blah...]

Message from arpwatch-3.2:
--
You can create an ethercodes.dat file by running this script:

    /usr/local/arpwatch/update-ethercodes

Here's a example crontab entry to update it every night:

    00 0 * * * root sleep `jot -r 1 0 600` ; /usr/local/arpwatch/update-ethercodes

The -m flag is deprecated. If you are using the -m watcher flag,
please switch to -w.

I checked my Cron after installing and I don't have that job listed. So my question is, do I need to manually add it? Or is this somehow handled a different way? (or is it just totally unnecessary...)