I know. But what if you do not need it? If you leave the link unchanged (as most of my users do), it does not work.
As stated in
http://www.freelists.org/archives/dokuwiki/03-2006/msg00562.html it would be better:
'* With {{:foo:bar.png|title}} it would be clearer to users what this second string is for and it is more likely that they will change it.'
or no '|title' at all.