Subtle syntax in using airodump-ng with netmasks

I recently needed to capture traffic from all APs that had the same MAC OUI. I struggled with the syntax and finally had success by making sure there are two spaces after the bssid value (before the -m). Entering only a single space does not work.

Here is what finally worked.

Code:

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airodump-ng -d 00:16:01:00:00:00  -m FF:FF:FF:00:00:00 wlan0

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This did NOT work:

Code:

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airodump-ng -d 00:16:01:00:00:00 -m FF:FF:FF:00:00:00 wlan0

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Cheers.

Added code boxes to make the difference between the two commands stand out - they looked exactly the same before I did this.