Index: trunk/src/obj_pstk_shape.h
===================================================================
--- trunk/src/obj_pstk_shape.h	(revision 38626)
+++ trunk/src/obj_pstk_shape.h	(revision 38627)
@@ -63,7 +63,7 @@
 		PCB_PSSH_CIRC,               /* filled circle */
 		PCB_PSSH_HSHADOW             /* for clearance: pretend the shape is the same as the drill's or slot's; but do not add anything positive to the target layer */
 	} shape;
-	rnd_coord_t clearance;         /* per layer clearance: internal layer clearance is sometimes different for production or insulation reasons (IPC2221A) */
+	rnd_coord_t clearance;         /* per layer clearance _DOUBLED_: internal layer clearance is sometimes different for production or insulation reasons (IPC2221A); for historial reasons this field contains the doubled value of the clearance gap */
 	unsigned hconn:1;              /* shape is connected to hole/slot; this is abstract, it ignores plating and bbvia aspects; valid only in the non-transformed proto, tr[0] */
 } pcb_pstk_shape_t;