coan.net: I would think you would have to be careful with adding another option as it may get less voes only because it was not there when the first people voted. I would suggest doing one or both of the following (if this is even ever implemented):
1. send a message to everyone already voted to inform them of the new option. 2. mark the added option so everyone knows it was not there originally when viewing the results.
(verstecken) Du kannst Freunden Mitteilungen mit nur einem klick senden indem du den kleinen Briefumschlag neben deren Namen anklickst. (pauloaguia) (zeige alle Tips)