lib/active_bugzilla/service.rb
def add_comment(bug_id, comment, params = {})
      params[:id]      = bug_id
      params[:comment] = comment
      execute('Bug.add_comment', params)["id"]
    end
def add_comment(bug_id, comment, params = {})
      params[:id]      = bug_id
      params[:comment] = comment
      execute('Bug.add_comment', params)["id"]
    end
http://www.bugzilla.org/docs/4.4/en/html/api/Bugzilla/WebService/Bug.html#add_comment