Index: obj_poly.h
===================================================================
--- obj_poly.h	(revision 9773)
+++ obj_poly.h	(revision 9774)
@@ -65,7 +65,7 @@
 
 void pcb_poly_rotate90(pcb_polygon_t *Polygon, pcb_coord_t X, pcb_coord_t Y, unsigned Number);
 void pcb_poly_rotate(pcb_layer_t *layer, pcb_polygon_t *poly, pcb_coord_t X, pcb_coord_t Y, double cosa, double sina);
-void pcb_poly_mirror(pcb_layer_t *layer, pcb_polygon_t *polygon);
+void pcb_poly_mirror(pcb_layer_t *layer, pcb_polygon_t *polygon, pcb_coord_t y_offs);
 void pcb_poly_flip_side(pcb_layer_t *layer, pcb_polygon_t *polygon);
 
 void pcb_poly_move(pcb_polygon_t *Polygon, pcb_coord_t DX, pcb_coord_t DY);