diff --git a/sys/sys/unistd.h b/sys/sys/unistd.h
index d7a986b0fb3d..450d841f4bdd 100644
--- a/sys/sys/unistd.h
+++ b/sys/sys/unistd.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)unistd.h	8.2 (Berkeley) 1/7/94
- * $Id: unistd.h,v 1.2 1996/04/02 05:23:09 kashmir Exp $
+ * $Id: unistd.h,v 1.6 1996/04/17 17:05:08 smpatel Exp $
  */
 
 #ifndef _SYS_UNISTD_H_
@@ -124,11 +124,17 @@
  *
  * XXX currently, operations without RFPROC set are not supported.
  */
-#define RFFDG		(1<<0)	/* copy fd table */
-#define RFPROC		(1<<1)	/* change child (else changes curproc) */
-#define RFMEM		(1<<2)	/* share `address space' */
-#define RFNOWAIT	(1<<3)	/* parent need not wait() on child */ 
-#define RFCFDG		(1<<4)	/* zero fd table */
-#define RFPPWAIT	(1<<5)	/* parent sleeps until child exits (vfork) */
+#define RFNAMEG		(1<<0)  /* UNIMPL new plan9 `name space' */
+#define RFENVG		(1<<1)  /* UNIMPL copy plan9 `env space' */
+#define RFFDG		(1<<2)  /* copy fd table */
+#define RFNOTEG		(1<<3)  /* UNIMPL create new plan9 `note group' */
+#define RFPROC		(1<<4)  /* change child (else changes curproc) */
+#define RFMEM		(1<<5)  /* share `address space' */
+#define RFNOWAIT	(1<<6)  /* parent need not wait() on child */ 
+#define RFCNAMEG	(1<<10) /* UNIMPL zero plan9 `name space' */
+#define RFCENVG		(1<<11) /* UNIMPL zero plan9 `env space' */
+#define RFCFDG		(1<<12) /* zero fd table */
+#define RFPPWAIT	(1<<31) /* parent sleeps until child exits (vfork) */
+
 
 #endif /* !_SYS_UNISTD_H_ */