Index: uspace/lib/usb/include/usb/devdrv.h
===================================================================
--- uspace/lib/usb/include/usb/devdrv.h	(revision 382f32662aa02f5dcfd7631f34cc56ff47b61575)
+++ uspace/lib/usb/include/usb/devdrv.h	(revision 33577f813dd0fb39d714910b93e1987c5b236aed)
@@ -79,5 +79,10 @@
 	 */
 	const char *name;
-	/** Expected endpoints description. */
+	/** Expected endpoints description, excluding default control endpoint.
+	 *
+	 * It MUST be of size expected_enpoints_count(excluding default ctrl) + 1
+	 * where the last record MUST BE NULL, otherwise catastrophic things may
+	 * happen.
+	 */
 	usb_endpoint_description_t **endpoints;
 	/** Driver ops. */