Exculde php url with vars using robots.txt

Exclude urls with vars using robots.txt

[alexmart]

Hello

I have a script that tracks downloads. The URL is in this format :

www.site.com/dl.php?var1=string&var2=string

What is the correct command to restrict bots from spidering that kind of file using robots.txt?
Will "Disallow: /dl.php" be enough?

Thank you

[Dijkgraaf]

Yes, that should be enough.