Index: uspace/lib/drv/include/usb_iface.h
===================================================================
--- uspace/lib/drv/include/usb_iface.h	(revision c280d7e51f5b91994557a7515f968b6e9c07544c)
+++ uspace/lib/drv/include/usb_iface.h	(revision 32b2a6f2ada68012ac1adeae0f0a262a7b8653d9)
@@ -45,8 +45,9 @@
 
 typedef struct {
-	usb_address_t address;
-	usb_speed_t speed;
-	devman_handle_t handle;
-	int iface;
+	usb_address_t address;		/** Current USB address */
+	uint8_t depth;			/** Depth in the hub hiearchy */
+	usb_speed_t speed;		/** Speed of the device */
+	devman_handle_t handle;		/** Handle to DDF function of the HC driver */
+	int iface;			/** Interface set by multi interface driver, -1 if none */
 } usb_device_desc_t;