diff --git a/EMkMachiningConst.h b/EMkMachiningConst.h
index 8ebcd65..cedf374 100644
--- a/EMkMachiningConst.h
+++ b/EMkMachiningConst.h
@@ -370,7 +370,8 @@ enum { MORTISE_PLUNGE_STEP = 0,
 enum { SURFROU_SUB_ZIGZAG = 0,
        SURFROU_SUB_ONEWAY = 1, 
        SURFROU_SUB_SPIRALIN = 2,
-       SURFROU_SUB_SPIRALOUT = 3} ;
+       SURFROU_SUB_SPIRALOUT = 3,
+       SURFROU_SUB_CONFORMAL_ZIGZAG = 4} ;
 // Tipo di attacco
 enum { SURFROU_LI_NONE = 0,
        SURFROU_LI_GLIDE = 1,