How to add comments to trade function?

Recently, I change my code for closing positon to the function using CTrade function as follows.

trade.PositionClose(Ticket_number);

In this case, how should I add comment to this, like " Magcic number x closed ".


I used to make comments if I use trade requests structure, as follows

request.comment = "Magcic number x closed ";

However, I don't know how to achieve this by using CTrade function.

I would appreciate any advice.