diff --git a/INSTALL.md b/INSTALL.md
index 3c3770dc..33058c8c 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -68,6 +68,8 @@ alsa =
 };
 
 ```
+The `volume_range_db = 60;` setting makes Shairport Sync use only the usable part of the built-in audio card mixer's attenuation range.
+
 The next step is to enable Shairport Sync to start automatically on boot up:
 ```
 # systemctl enable shairport-sync