Add comment for the timestamp option

packet-exchange/src/client.c

@@ -4,16 +4,18 @@
  * Bash options:
  *
  *  -a          Run the real time thread on CPU1
- *  -e          Set a txtime
+ *  -e          Set a txtime (to be used in an ETF qdisc)
  *  -f          Set the network interface to be used
  *  -i USEC     Wake up the real time thread every USEC microseconds (Default: 10ms)
  *  -l N        Wake up the real time thread N times (Default: 0)
  *  -p PRIO     Run the real time thread at priority PRIO
  *  -r USEC     Refresh the non real time main thread every USEC microseconds (Default: 50ms)
+ *  -t          Enable timestamps
  *
  * Large portions taken from cyclictest
  *
  */
+
 #define _GNU_SOURCE
 #include <errno.h>
 #include <error.h>