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isAxisAnnotationEnabled on a data chart line-series

I'm looking at the sample here:

And trying to add crosshairs with axis annotation to a igx-line-series instead of a igx-column-series. I added the following line to my data chart:

<igx-crosshair-layer isAxisAnnotationEnabled=true></igx-crosshair-layer>
and I get the crosshairs but don't get the annotations on the side and top that call out the current value. Any tips on what I'm doing wrong?