This is for California
Sometimes a complaint is filed, and then the Plaintiff wishes to add or change information in the complaint. There are specific rules of civil procedure which deal with this issue. Discuss the federal and your state’s rules regarding the ability to amend or supplement the pleading. Are there requirements that must be met to supplement or amend a pleading? Is there a difference between supplementing and amending? Can the other party oppose an amendment or supplementation? Can a defendant supplement or amend his pleadings as well?