Talk:Critical Hit

Can someone explain me please how agility really works? If I have +38 with my equipment that means that my base crit chance is 2 if it was originally 40, right? But here it can be seen that agi affects crit only up to 5 base crit chance, and not below.

Two questions: a) is it documented how agi affects crit chance when base crit is under 5? b) according to the chart, already with 30 agi I can have the top crit chance if I have +36 crit chance from equipment. Is that true?