Multiple Lines in Subtitle Area of Map Annotation

I currently have an AnnotationDelegate prototyped like so:

@synthesize title; @synthesize subtitle; @synthesize coordinate;
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However, when the subtitle is a string containing \n (newline characters), it doesn't continue on the next line. Rather, it is just truncated and given a few trailing dots. Is there some way to allow for multiple line subtitles?

Thank you for any help.