Index: undo.h
===================================================================
--- undo.h	(revision 16777)
+++ undo.h	(revision 16778)
@@ -52,6 +52,8 @@
 
 void pcb_undo_freeze_serial(void);
 void pcb_undo_unfreeze_serial(void);
+void pcb_undo_freeze_add(void);
+void pcb_undo_unfreeze_add(void);
 
 /* Returns 0 if undo integrity is not broken */
 int undo_check(void);