IMac 21,5" as an External monitor

Hi everybody!
Can I use a iMac 21,5" as an external monitor for my MacBook Air via Thunderbolt?
I've been told that that is possible only with the bigger iMac 27"!
Thankyou!
gaspero

Thankyou
But, here
http://docs.info.apple.com/article.html?path=Thunderbolt/10.6/en/30822.html
it doesn't make differences between models.. It seems that ANY iMac with thunderbolt can serve as a target monitor to any computer with thunderbolt...

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