[ogf-d20-l] Another Trademark question

[lizard]

How can we add new effects (i.e, benefits not described in the SRD) upon
gaining a level? For example, I might have developed a point-based magic
system. Each level, a character gains a certain number of magic points.
Can this just be specified in the class description, i.e, "Archmagi gain
50 magic points per level"?