I am using an xtline to graph two variables with very different scales. I am using the code below

xtline ManufacturingProperty, addplot(line FeeinLieuandJointInd year, yaxis(2))

It works in the sense that it allows me to use different scales for the left and right Y axis but I cannot figure out how to label the 2nd Y axis since addplot does not seem to allow ytitle() as a suboption.