Index: uspace/lib/usb/include/usb/devdrv.h
===================================================================
--- uspace/lib/usb/include/usb/devdrv.h	(revision 81dce9f771a48fddabf8296e844817d7c79b4879)
+++ uspace/lib/usb/include/usb/devdrv.h	(revision 79c8a964862f0ce14d3cec5fc6a0af2ebf9fa793)
@@ -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. */