Can I create a spell magnitude modification Perk that applies it's effects to one spell only?

E.g. I have a spell, magicmissile with a magnitude to 10 Can I create a perk that increases the magnitude of only that spell?

I think I've misunderstood how to use Perks. I thought that I can apply a Perk with a Mod Spell Magnitude entry point to a specific spell.
It seems that it effects all spells that you own.

Take a look at how augmented flames/etc is set up

could probably check out the HasSpell condition.

1. Create perk
2. Give a unique keyword to your spell
3. In the perk entry go to spell tab
4. In spell tab make a new condition:
HasKeyword youruniquekeyword
Ready to launch...

Cool! Thanks guys! I missed that Condition on the Spell to filter out which spells the Perk effects. Cheers!