Update README.md

README.md

@@ -22,7 +22,9 @@ calls to clock_gettime
 a simplified version of cyclictest I wrote to have a better understanding and more control.
 
 * packet-exchange has a client and a server, which exchange UDP ethernet packets using real-time threads,
-and can send them on a ETF qdisc by setting a txtime timestamp.
+and can send them on a ETF qdisc by setting a txtime timestamp. software timestamps can be generated using
+the SO_TIMESTAMPING option, and timestamps inside the userspace program, for measuring purposes. A RTT 
+option also exists to measure RTT of an UDP packet.
 
 ## Scripts