diff --git a/doc/yambar-modules-removables.5.scd b/doc/yambar-modules-removables.5.scd
index 4b984fa..cbffebe 100644
--- a/doc/yambar-modules-removables.5.scd
+++ b/doc/yambar-modules-removables.5.scd
@@ -22,6 +22,10 @@ instantiates the provided _content_ particle for each detected drive.
 |  optical
 :  bool
 :  True if the drive is an optical drive (CD-ROM, DVD-ROM etc)
+|  audio
+:  bool
+:  True if an optical drive has an audio CD inserted (i.e. this
+   property is always false for non-optical drives).
 |  device
 :  string
 :  Volume device name (typically */dev/sd?*)