Add {deprecated} annotation to ListDevices()
diff --git a/doc/adapter-api.txt b/doc/adapter-api.txt
index 213bc02..48cab40 100644
--- a/doc/adapter-api.txt
+++ b/doc/adapter-api.txt
@@ -80,9 +80,11 @@
 			Possible Errors: org.bluez.Error.DoesNotExist
 					 org.bluez.Error.InvalidArguments
 
-		array{object} ListDevices()
+		array{object} ListDevices() {deprecated}
 
 			Returns list of device object paths.
+			This method is deprecated, instead use the Devices
+			Property to get the list of devices object paths.
 
 			Possible errors: org.bluez.Error.InvalidArguments
 					 org.bluez.Error.Failed