Driveshaft grease fitting?

["Jeff McNeal" <jmcneal@ohms.com>]

Hi everyone.  The other day while I was crawling under my car to check and
top up the differential fluid level, I noticed that the u-joint on the rear
flange of my driveshaft (the side the connects to the differential) has a
grease zirk fitting on it!

I din't recall seeing any reference to this fitting or instructions for
lubing in my manual.  Did I somehow miss this one?  If so, how many strokes?

Best wishes,

Jeff in San Diego