added notes about new dcd options

dcd.pl

@@ -512,6 +512,19 @@ instead of
 
       "registry" : "DataCite_Test_Prod",
 
+=head1 TODO
+
+=head2 using ticket number for register
+
+  dcd.pl --ticket ##### register
+
+This command should retrieve all objects asociated with the given ticket
+number from the idenetifiers table and register them.
+
+Until then, this also should work
+
+  tsv identifiers.tsv --select ticket=##### --col canoical_url -O- | xargs ./dcd.pl register --doit
+
 =head1 NOTES
 
 =head2 uscholar