Ignition Coil Installation

1968 Dodge Dart 225

I'm reinstalling my ignition coil. I didn't document the original arrangement when I disassembled this a year ago. Would someone please advise how the small can (condenser?) is connected. I assume its pigtail attaches to one of the coil terminals (+ or - ). My electrical diagram doesn't appear to show this part. Is this a radio suppression feature?

Thanks.