Button_to with "GET" and extra parameters

I have the following in one of my views:

 <%= button_to 'Edit', {:action => 'edit_mbr_cit', :id =>

@member, :extra => @citation}, :method => ‘get’%>

This generates resaonable HTML as follows:

However, when clicked, the “GET” request does not have the “extra”
parameter, as shown below:

Processing GateaccessController#edit_mbr_cit (for 127.0.0.1 at
2007-07-14 11:12:51) [GET]
Session ID: e1d723aad01fa7332de579a7bd15f59e
Parameters: {“action”=>“edit_mbr_cit”, “id”=>“7641”,
“controller”=>“gateaccess”}

Can somebody explain why the controller isn’t receiving what the HTML
says it should be generating?

Thanks