Index: board.h
===================================================================
--- board.h	(revision 19254)
+++ board.h	(revision 19255)
@@ -118,10 +118,10 @@
    force is non-zero, overwrite even existing colors. */
 void pcb_layer_colors_from_conf(pcb_board_t *pcb, int force);
 
-/* counts the number of plated and unplated holes in the design within
-   a given area of the board. To count for the whole board, pass NULL
-   within_area. */
-void pcb_board_count_holes(pcb_board_t *pcb, int *plated, int *unplated, const pcb_box_t * within_area);
+/* counts the number of plated and unplated holes or slots in the design within
+   a given area of the board. To count for the whole board, pass NULL within_area. */
+void pcb_board_count_holes(pcb_board_t *pcb, int *plated, int *unplated, const pcb_box_t *within_area);
+void pcb_board_count_slots(pcb_board_t *pcb, int *plated, int *unplated, const pcb_box_t *within_area);
 
 #define	PCB_SWAP_X(x)		(PCB_SWAP_SIGN_X(x))
 #define	PCB_SWAP_Y(y)		(PCB->MaxHeight +PCB_SWAP_SIGN_Y(y))