diff --git a/heart_rate_sensor_protocol.h b/heart_rate_sensor_protocol.h
index d59e100..c5f99c8 100644
--- a/heart_rate_sensor_protocol.h
+++ b/heart_rate_sensor_protocol.h
@@ -150,6 +150,7 @@ typedef struct {
   uint8_t  captureRate;  // N*10HZ
   uint8_t  capturePrecision;
   uint8_t  compressAlgorithm;  // ѹËõËã·¨
+  uint32_t checksum;           // УÑéºÍ
 } read_record_info_receipt_t;
 
 typedef struct {