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 Shairport Sync on FreeBSD
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-Shairport Sync runs natively on FreeBSD using the `sndio` back end, thanks to the work of [Tobias Kortkamp (t6)](https://github.com/t6).
+This guide, for a recent FreeBSD system, is to build Shairport Sync to output to the [`sndio`](https://sndio.org) and/or the [ALSA](https://www.alsa-project.org/wiki/Main_Page) sound systems.
 
-[`sndio`](http://www.sndio.org) is *"a small audio and MIDI framework part of the OpenBSD project and ported to FreeBSD, Linux and NetBSD"* developed by Alexandre Ratchov (see also [this paper](http://www.openbsd.org/papers/asiabsdcon2010_sndio.pdf) for more details).
+The `sndio` back end is based on the work of [Tobias Kortkamp (t6)](https://github.com/t6).
 
-The build instructions here build Shairport Sync to output to the `sndio` and/or the `ALSA` sound systems. `ALSA` is the [Advanced Linux Sound Architecture](https://www.alsa-project.org/wiki/Main_Page), so it is not "native" to FreeBSD, but it has been ported to some architectures under FreeBSD. 
+ALSA is not "native" to FreeBSD, but it has been ported to some architectures.
 
-Build instructions are different from previous versions of Shairport Sync and may change further. For now, leave the settings in the configuration file at default except as noted below.
+Shairport Sync can be built as an AirPlay 2 player (with [some limitations](https://github.com/mikebrady/shairport-sync/blob/development/AIRPLAY2.md#features-and-limitations)) or as "Classic" Shairport Sync – a player for the older, but still supported, AirPlay (aka "AirPlay 1") protocol.
 
 Overall, you'll be building and installing two programs. The first one is NQPTP, a companion app that Shairport Sync uses for AirPlay 2 timing, and the second one is Shairport Sync itself. Build and install NQPTP first. If you are building Classic Shairport Sync, NQPTP is unnecessary and can be omitted.