Wis. Stat. § 180.1021: Bylaw fixing quorum or voting requirements for shareholders.

(1) If authorized by the articles of incorporation, the shareholders may adopt or amend a bylaw that fixes a greater or lower quorum requirement or a greater voting requirement for shareholders or voting groups of shareholders than is provided by this chapter. The adoption or amendment of a bylaw that adds, changes or deletes a greater or lower quorum requirement or a greater voting requirement for shareholders must meet the same quorum requirement and be adopted by the same vote and voting groups required to take action under the quorum and voting requirement then in effect.

(2) A bylaw that fixes a greater or lower quorum requirement or a greater voting requirement for shareholders under sub. (1) may not be adopted, amended or repealed by the board of directors.