Special Characters

In actions that accept text, such as changing the description of a card, posting a comment, or sending an email notification, you can enter newline characters by using the notation \n. For example:

when a card is moved to list "Done" by anyone,
set the card's description to "Completed by: {username} \n\n Completed On: {date}"

Note the double newline character. This is necessary because Trello uses markdown formatting, which requires an empty line to actually separate the lines.

NOTE  If you need to enter the text \n in your command, but don't want it to be transformed to a newline character, you need to "escape" it like this: \\n.