diff --git a/Inc/CanSerialPortFrame.h b/Inc/CanSerialPortFrame.h
index 709c272..9f236df 100644
--- a/Inc/CanSerialPortFrame.h
+++ b/Inc/CanSerialPortFrame.h
@@ -45,7 +45,6 @@ typedef struct
 {
     FLEXCAN_IdType  eRxFrameType;   /**< FLEXCAN ID type, 0 STD, 1 EXT */
     uint32_t        u32RxCanId;     /**< FLEXCAN received ID           */
-    uint32_t        u32RxCanIdMask; /**< FLEXCAN received ID mask, if mask bit is 1, received FLEXCAN id bit must same to u32RxCanId, or mask bit is 0, id bit is ignored */
     uint8_t filter;
 } FilterTo_FLEXCAN_RxMbFilterType;