diff --git a/protocol/reg_index.cpp b/protocol/reg_index.cpp
index d13c5fe..468c3ea 100644
--- a/protocol/reg_index.cpp
+++ b/protocol/reg_index.cpp
@@ -83,7 +83,6 @@ static reginfo_t table[] = {
     REG_ITERM(kreg_pipette_zm_pos_devi_tolerance),
     REG_ITERM(kreg_pipette_zm_io_trigger_append_distance),
     REG_ITERM(kreg_pipette_zm_has_move_zero),
-    
 
     REG_ITERM(kreg_a8k_opt_t_pos_offset),
     REG_ITERM(kreg_a8k_opt_f_pos_offset),
@@ -130,6 +129,7 @@ static reginfo_t table[] = {
     REG_ITERM(kreg_step_motor_is_enable),
     REG_ITERM(kreg_step_motor_dpos),
     REG_ITERM(kreg_step_motor_has_move_zero),
+    REG_ITERM(kreg_step_motor_lost_step),
     REG_ITERM(kreg_step_motor_shift),
     REG_ITERM(kreg_step_motor_shaft),
     REG_ITERM(kreg_step_motor_one_circle_pulse),
diff --git a/protocol/reg_index.hpp b/protocol/reg_index.hpp
index 0cd8582..b0713d7 100644
--- a/protocol/reg_index.hpp
+++ b/protocol/reg_index.hpp
@@ -148,6 +148,7 @@ typedef enum {
   kreg_step_motor_is_enable                    = 10102,  // 步进电机是否使能
   kreg_step_motor_dpos                         = 10103,  // 执行完上一条指令后的相对位移
   kreg_step_motor_has_move_zero                = 10104,  // 是否回零
+  kreg_step_motor_lost_step                    = 10105,  // 丢失步数
   kreg_step_motor_shift                        = 10150,  // x偏移
   kreg_step_motor_shaft                        = 10151,  // x轴是否反转
   kreg_step_motor_one_circle_pulse             = 10152,  // x轴一圈脉冲数
@@ -173,7 +174,7 @@ typedef enum {
   kreg_step_motor_tzerowait                    = 10188,  //
   kreg_step_motor_enc_resolution               = 10189,  // 编码器分辨率 1000,1024,4000,4096,16384
   kreg_step_motor_enable_enc                   = 10190,  //
-  kreg_step_motor_dzero_pos                    = 10191,  // 驱动器处于调试模式
+  kreg_step_motor_dzero_pos                    = 10191,  //
   kreg_step_motor_pos_devi_tolerance           = 10192,  // 位置偏差容忍度
   kreg_step_motor_io_trigger_append_distance   = 10193,  // 移动到IO时，会在原点触发的边沿，稍稍里面移动一点，用来保证IO稳定触发