Displaying custom field with ckeditor

In the requirement detail page, I'm able to add new custom fields and new custom drop down list. Perfect.
Now I would like to add a CustomComment field displayed with ckeditor (like the description field)
I have declared the field in the requirement database and in the requirementMain.php.
The field is displayed but like a standards field, not with ckeditor.
Question:
is there any specific attribute to insert in $_fieldsAttribute to make it displayed with ckeditor ?

Thanks in advance.

It works ! Thanks a lot !