Document that CSV import file needs a special structure

Problem/Motivation

I have a list with 200 terms in a CSV file that I wanted to import.
Only after installing the module, enabling it, manually navigating to the import URL and trying it out I saw that a simple list with terms cannot be imported.

The CSV needs a special structure:

"name,status,description,format,weight,parent_name,[any_additional_fields];
name,status,description,format,weight,parent_name[;parent_name1;parent_name2;...],[any_additional_fields]"
"tid,uuid,name,status,revision_id,description,format,weight,parent_name[;parent_name1;parent_name2;...],parent_tid[;parent_tid1;parent_tid2;...],[any_additional_fields];
tid,uuid,name,status,revision_id,description,format,weight,parent_name,parent_tid,[any_additional_fields]"

This should be documented on the front page of this module.