Index: obj_pstk_op.h
===================================================================
--- obj_pstk_op.h	(revision 35854)
+++ obj_pstk_op.h	(revision 35855)
@@ -42,9 +42,11 @@
 
 void *pcb_pstkop_change_flag(pcb_opctx_t *ctx, pcb_pstk_t *ps);
 
-void *pcb_pstkop_rotate90(pcb_opctx_t *ctx, pcb_pstk_t *ps);
-void *pcb_pstkop_rotate(pcb_opctx_t *ctx, pcb_pstk_t *ps);
+void *pcb_pstkop_rotate90(pcb_opctx_t *ctx, pcb_pstk_t *ps); /* side effect: may also make an undoable move */
+void *pcb_pstkop_rotate(pcb_opctx_t *ctx, pcb_pstk_t *ps); /* side effect: may also make an undoable move */
+void *pcb_pstkop_rotate_(pcb_opctx_t *ctx, pcb_pstk_t *ps, rnd_bool undoable);
 
+
 void *pcb_pstkop_change_size(pcb_opctx_t *ctx, pcb_pstk_t *ps);
 void *pcb_pstkop_change_clear_size(pcb_opctx_t *ctx, pcb_pstk_t *ps); /* changes the global clearance */
 void *pcb_pstkop_change_2nd_size(pcb_opctx_t *ctx, pcb_pstk_t *ps);