about "struct ct_foo_info" in hacking howto

[luoqiang]

Hi,all

In hacking howto "4.4.5.3 Example skeleton of a conntrack helper module":

              ......
              if (there_will_be_new_packets_related_to_this_connection)
               {
                       t = new_tuple_specifying_related_packets;
                       ip_conntrack_expect_related(ct, &t);
 
                       /* save information important for NAT in
                               ct->help.ct_foo_info;   */
                               ~~~~~~~~~~~~~~~~~~~~here!!
               }
              ......

but in ip_conntrack.help,there is no member ct_foo_info in union help. how 
can I do? Fill in ct->nat.info?

thanks 
luoqiang