Index: change.h
===================================================================
--- change.h	(revision 28776)
+++ change.h	(revision 28777)
@@ -108,4 +108,8 @@
 /* Invalidate the term label of an object */
 void *pcb_obj_invalidate_label(pcb_objtype_t Type, void *Ptr1, void *Ptr2, void *Ptr3);
 
+/* Undoable obj attribute change; if new_value is NULL, delete the attribute */
+int pcb_uchg_attr(pcb_board_t *pcb, pcb_any_obj_t *obj, const char *key, const char *new_value);
+
+
 #endif