diff --git a/README.md b/README.md
index b30c1f8..5678555 100644
--- a/README.md
+++ b/README.md
@@ -215,7 +215,50 @@ TODO
 
 ### Sound
 
+Based on https://wiki.alpinelinux.org/wiki/PipeWire
+
 ```
-doas apk add pamixer
+doas apk add dbus dbus-openrc
+doas rc-service dbus start
+doas apk add pipewire wireplumber rtkit alsa-utils pipewire-alsa
+doas addgroup YOURUSER rtkit
+doas addgroup root audio
+alsamixer
 ```
-TODO
+
+In alsamixer, use F6 to find the target sound card (most likely 0 is HDMI and 1 is ordinary).
+Remember its number, and in `/usr/share/alsa/alsa.conf`,
+replace `defaults.ctl.card` and `defaults.pcm.card` with the target number.
+
+In `/usr/local/bin/inga-river`, replace `river $@` with `dbus-run-session -- river $@`,
+relogin (Ctrl+Shift+E).
+
+Then
+```
+doas rc-service alsa start
+doas rc-update add alsa
+/usr/libexec/pipewire-launcher
+```
+
+Make sure that everything works (with `wpctl status`, `pw-cat -p YOURFILE.flac`
+or just opening YouTube in FF).
+
+Then make pipewire start automatically: in river config, add another startup line:
+```
+riverctl spawn "/usr/libexec/pipewire-launcher"
+```
+
+Control microphone and volume with `alsamixer`.
+
+Note that the internal microphone does not work and is not detected by pipewire.
+Only external microphones work.
+
+### Webcam
+
+Should work after following the steps for "Audio".
+
+Can be tested in https://webrtc.github.io/test-pages
+
+### Mic in browser
+
+Does not work???