Enhancement Scrolls

Hello

Been trying to find a thread about this, but couldnt find any.

I heard theres a fixed status about how the Enhancement Scrolls (stars) works.
Like, at X att weapon each star add X att.

Is there any thread with this system?
Could anyone explain it?

Thanks

Like this I think:
W.Att - Atk u Gain
1-50:+1atk
50-100:+2atk
100-150:+3atk
150-200:+4atk
200-250:+5atk
250-300:+6atk