diff --git a/sys/sys/wormio.h b/sys/sys/wormio.h
index 56fbac46d146..4d95d348c14f 100644
--- a/sys/sys/wormio.h
+++ b/sys/sys/wormio.h
@@ -1,4 +1,5 @@
 /* Shared between kernel & process */
+/* $FreeBSD$ */
 
 #ifndef	_SYS_WORMIO_H_
 #define	_SYS_WORMIO_H_
@@ -98,6 +99,9 @@ struct wormio_first_writable_addr {
 };
 #define WORMIOCFIRSTWRITABLEADDR  _IOWR('W', 33, struct wormio_first_writable_addr)
 
+#define CDRIOCBLANK		_IO('c', 100)
+#define CDRIOCNEXTWRITEABLEADDR	_IOR('c', 101, int)
+
 /* Errors/warnings */
 #define WORM_SEQUENCE_ERROR                  1
 #define WORM_DUMMY_BLOCKS_ADDED              2