Correct! Any Wizard could use that spell, and all other Mage types would be excluded.
There are also spells that are limited by spell school only (Arcane, Holy, etc).
ahhhh very interesting idea. so not only is there Wizard only spells, but for example fire only spells? so only a mage who actually had the fire school could cast it? brilliant idea it adds flavor while still retaining great flexability in spellbook design