Index: trunk/src/libcschem/operation.h
===================================================================
--- trunk/src/libcschem/operation.h	(revision 6562)
+++ trunk/src/libcschem/operation.h	(revision 6563)
@@ -63,7 +63,7 @@
 csch_chdr_t *csch_cnc_remove(csch_sheet_t *sheet, csch_chdr_t *obj);
 
 
-/* migrate all objects from src to dst, leaving src empty */
+/* migrate all objects from src to dst, leaving src empty (always undoable) */
 void csch_op_merge_into(csch_sheet_t *sheet, csch_cgrp_t *dst, csch_cgrp_t *src);
 
 int csch_isc_with_box(csch_chdr_t *obj, csch_rtree_box_t *box);