A magic-user's ability to use sigils is due to an advanced genetic modification at birth - a mutation that has the unfortunate side effect of total blindness.

A clarification isn't definitive like a sentence though. So it doesn't really matter what it involves - as long as it's hypothetical and not more than one paragraph (without being a wall of text).

However, as a clarification, it is supposed to be a clarification, and my judgement had lead me to believe that was in fact a paragraph of rule, adressing an area without lack of clarity.
Though to be fair to the post quoted, I don't feel I understand with certainty what it's trying to say.

EDIT:
The number of credits starting characters have is equal to 150 + [(Influence+Creativity+2)x(Inluence+Aptitude)] + (50xLevel).

Okay, here's a clarification. People don't have to agree on it, because it isn't definitive. Because it's hypothetical, it can include additional suggestions. Usually, this sorta thing helps get the devs rolling. None of it is definitive, so the devs are free to change these things - sentences on the other hand have to be voted out to get changed whereas paragraphs have to be voted in to matter at all.

Credits are money. Money is almost everything in this, because dying is easy and skills mostly help with using equipment rather then plain survival or kicking butt fantasy-style.
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The above is a paragraph because it consists of more than one sentence.

I feel our definitions of the word "clarification" differ.

Alright, forget I used the word clarification. I meant 'elaborate'.

I only just realised that you are in fact the OP.
This changes things.
I appologise for being "challenging".

I would supply an additional rule here, though the last was also mine.

Stats are purchased with points at character creation, with each additional 'dot' beyond 1 costing 1.5* the next level in points (rounded down). For example, purchasing a second 'dot' would cost 3 (1.5*2) points, and level 3 would cost 7 (1.5*2+1.5*3) points.

All remaining points after character creation are converted into Fate Points at a rate of one-for-one.

The most commonly used die is a d12 (d12s need more love!).