Format KM curve with median survival line

[GS2]

Hello,

Using SAS 9.4

Is their a way to add a median survival line to a KM curve? Thanks

[WarrenKuhfeld]

http://support.sas.com/documentation/onlinedoc/stat/142/kaplan.pdf

There are many examples of customizing the KM plot here.  Page 839 starts the example of adding a reference line.