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 # NQPTP – Not Quite PTP
-The `nqptp` daemon monitors PTP traffic. Briefly, `nqptp` monitors the times of any [PTP](https://en.wikipedia.org/wiki/Precision_Time_Protocol) clocks – up to 32 – it sees on ports 319 and 320. It maintains records for each clock, identified by its Clock ID and IP. Information about the *master clock* is provided in a [POSIX shared memory](https://pubs.opengroup.org/onlinepubs/007908799/xsh/shm_open.html) interface at `/nqptp`. Here are details of the interface:
+The `nqptp` daemon monitors PTP traffic. Briefly, `nqptp` monitors the times of any [PTP](https://en.wikipedia.org/wiki/Precision_Time_Protocol) clocks – up to 32 – it sees on ports 319 and 320. It maintains records for each clock, identified by its Clock ID and IP. Information about the *master clock* is provided in a [POSIX shared memory](https://pubs.opengroup.org/onlinepubs/007908799/xsh/shm_open.html) interface at `/nqptp`. 
+
+A timing peer list can be sent to `nqptp` over port 9000. The list consists of the letter 'T' followed by a space-separated list of the IP numbers of the timing peers. The list *completely replaces* any existing timing peer list.
+
+
+Here are details of the interface:
 ```c
 struct shm_structure {
   pthread_mutex_t shm_mutex; // for safely accessing the structure