diff --git a/README.md b/README.md
index b0a88ed..92dcbc8 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,8 @@ Additionally, the following applications and libraries are required to be instal
 - IPMPV_CORNER_RADIUS: Corner radius of the OSD. Set to 0 for sharp edges. Default: 15
 - IPMPV_RETROARCH_CMD: Your custom RetroArch command, if any. Default: 'retroarch'
 - IPMPV_HWDEC: Hardware decoding device to be passed along to MPV, e.g. vaapi. Default: 'auto-safe'
+- IPMPV_AO: Audio playback API, e.g. pipewire. Note: volume control only works properly with ALSA at the moment. Default: 'alsa'
+- IPMPV_UPDATE_INTERVAL: Channel update interval in seconds. Default: 3600
 
 ## Coming Soon