diff --git a/doc/device-api.txt b/doc/device-api.txt
index 94c23e99..c135e433 100644
--- a/doc/device-api.txt
+++ b/doc/device-api.txt
@@ -89,3 +89,7 @@ Properties	string Name [readonly]
 			Reflects whether the device is currently scanning
 			for networks.  net.connman.iwd.Network objects are
 			updated when this property goes from true to false.
+
+		object Adapter [readonly]
+
+			The object path of the adapter the device belongs to.