How do I insert break in text box?

Hey all. I searched around and figured it might be quicker to just ask this dumb question.

When entering in text in a SpriteFont box, is there a way to insert a </br> so that the text will start a new line?

scripting the box to as:

"testing text" <br> "blah blah"

would create:

testing text

blah blah

Thanks as always for your time.