diff --git a/api/i_step_motor_ctrl_module.hpp b/api/i_step_motor_ctrl_module.hpp
index 899b558..22e4c1b 100644
--- a/api/i_step_motor_ctrl_module.hpp
+++ b/api/i_step_motor_ctrl_module.hpp
@@ -55,10 +55,14 @@ class I_StepMotorCtrlModule {
     s32 max_x;
     //
     s32 shift_x;
-    s32 run_to_zero_move_to_zero_max_d;
-    s32 run_to_zero_leave_from_zero_max_d;
+
+    s32 run_to_zero_max_d;
     s32 run_to_zero_speed;
     s32 run_to_zero_dec;
+    
+    s32 look_zero_edge_max_d;
+    s32 look_zero_edge_speed;
+    s32 look_zero_edge_dec;
   } base_param_t;
 
   typedef struct {