How to permanently boot up in verbose mode?

Hi,
I want to always boot up OS X Mavericks (10.9.2) in verbose mode (debug mode) as I pressed Cmd+V everytime.
I remember an old command which I used on Snow Leopard for doing this:
« sudo nvram boot-args="-v" »
but I don't know if it's still valid on Mavericks!!
The command « nvram -p » works and doesn't show any "-v" verbalization in the "boot-args" section, so I'm currently thinking my command is still valid (it does still show other commands, though).
But I need your help, Apple experts! Can you confirm this?
Thanks in advance,
Tyrexionibus
Message was edited by: Tyrexionibus

Restart the computer. At the chime press and hold down the SHIFT key until you see the spinning gear below the Apple Logo. You should also see a progress bar appear. Booting into Safe Mode takes much longer than a normal startup.

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