How to add a newline into a string?

How to add a newline into a string?

I have a multi-line text field for a little todo list, coupled with a single-line text "update" field.

Example:

Can you call Dan at ABC plumbers on 12345678 re: the leaky pipe?

Called Dan - said he'd be available to visit tomorrow.


This update field has an on user input event that is meant to add the update text to the main todo field, so I have a history of prior updates. However, when I add the field with the + operator it doesn't add a line, it just concatenates the text straight on the end:

Can you call Dan at ABC plumbers on 12345678 re: the leaky pipe?Called Dan - said he'd be available to visit tomorrow.


How do I get it to look like the following:

Can you call Dan at ABC plumbers on 12345678 re: the leaky pipe?
Called Dan - said he'd be available to visit tomorrow.


Is there a newline character available that I can add in there to improve the layout?