W. Va. Code § 48-5-405: Amendments to pleadings.

Amendments to pleadings in an action for divorce are permitted upon the same general considerations which govern the practice in other proceedings, and are properly allowed for the purpose of making the allegations of the pleading more definite and certain, of asserting an essential allegation which has been omitted, or of including allegations of misconduct committed subsequent to the commencement of the action.