Update RELEASENOTES.md

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@@ -4,7 +4,7 @@ Internal changes are being made for version 3.3 to avoid using `SIGUSR1` and `pt
 
 **New Features**
 * Add the command `quit` to the MPRIS and the D-Bus interfaces. The main motivation for this is that it makes it easier to search for memory leaks.
-* Log the output rate, in frames per second, in the `statistics` output, for the entire play session since that last pause/resume, if any. The rate is timed relative to `CLOCK_MONOTONIC`. When your system is connected for an appreciable period to network time, e.g. using an NTP client, `CLOCK_MONOTONIC` is adjusted ("conditioned") to keep time extremely accurately. This means that the output rate figure should be very accurate, especially over a long play session, say a couple of hours.
+* Log the input and output frame rates in the `statistics` output. The figures generated are averaged over the entire play session since the last pause/resume, if any, so they should settle down and become more accurate over a long play session, say a couple of hours. Timing is done relative to `CLOCK_MONOTONIC`. When your system is connected for an appreciable period to network time, e.g. using an NTP client, `CLOCK_MONOTONIC` is adjusted ("conditioned") to keep time extremely accurately. The output frame rate should be very accurate. The calculated input frame rate will vary considerably over short intervals due to network conditions, but over a long play session it should also become very accurate.
 Timing is done from the start of the play session, or from the resumption of play following a pause. Note that while some sources pause and resume between tracks, both iTunes on the Mac and the Music app on iOS play all the tracks on a playlist without pause, so long as the tracks are downloaded and present in the device in time.
 
 **Bug Fixes**