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diff --git a/ikiwiki/directive/poll.mdwn b/ikiwiki/directive/poll.mdwn
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@@ -19,6 +19,8 @@ Parameters:
* `open` - Whether voting is still open. Set to "no" to close the poll to
voting.
+* `expandable` - Set to "yes" to make this poll have an interface to add
+ another choice to the poll.
* `total` - Show total number of votes at bottom of poll. Default is "yes".
* `percent` - Whether to display percents. Default is "yes".