Index: obj_subc.h
===================================================================
--- obj_subc.h	(revision 22623)
+++ obj_subc.h	(revision 22624)
@@ -131,8 +131,9 @@
 void *pcb_subc_remove(pcb_subc_t *sc);
 
 /* In board mode return brd_layer; in footprint edit mode, return the subcircuit
-   layer that matches brd_layer or brd_layer if not found. */
-pcb_layer_t *pcb_loose_subc_layer(pcb_board_t *pcb, pcb_layer_t *brd_layer);
+   layer that matches brd_layer. If not found, either allocate it within
+   the subc (if alloc is true) or return the brd_layer. */
+pcb_layer_t *pcb_loose_subc_layer(pcb_board_t *pcb, pcb_layer_t *brd_layer, pcb_bool alloc);
 
 /* Returns whether there's no object in the subc */
 pcb_bool pcb_subc_is_empty(pcb_subc_t *subc);