# Edit question with minor typo

I just answered this question and found a typo within the definition of the $CF_j$ formula. I wanted to edit the question and correct the typo, which is essentially for the subsequent math and the understanding of the formula. However, i get this warning:

Edits must be at least 6 characters; is there something else to improve in this post?

How should we correct typos within formulas, which are typically less than six characters but of high importance for the math?