diff --git a/canbed_dual.h b/canbed_dual.h
index 85ac183..cd84156 100644
--- a/canbed_dual.h
+++ b/canbed_dual.h
@@ -1,29 +1,25 @@
-// aruino library for CANBed Dual
+// Arduino library for CANBed Dual GD32E103CBT6
 
 #include <Wire.h>
 #include <Arduino.h>
 
 #define I2C_ADDR    0X41
 #define CANI2C      Wire1
-#define DELAY_TIME  0
 
 class CANBedDual
 {
-    private:
-    
+  private:
     unsigned long timerDelay = 0;
     int canNum = 0;
+    unsigned char canConfig[48];
     
-    unsigned char canconfig[48];
-    
-    private:
-    
+  private:
     unsigned long char2long(unsigned char *str);
     void long2char(unsigned long __t, unsigned char *str);
     void makeCanConfig();
     void sendConfig();
-    public:
     
+  public:
     CANBedDual(int num)
     {
         canNum = num;
@@ -31,10 +27,14 @@ class CANBedDual
     
     void init(unsigned long speed);
     void initFD(unsigned long speed20, unsigned long speedfd);
-    
     void initMaskFilt(unsigned char num, unsigned char ext, unsigned long mask, unsigned long filt);
-    
+    // id  CAN id
+    // ext 0:standard, 1:extended, 
+    // rtr 0:data, 1:remote
+    // fd  0:classic 1:can fd
+    // len data length
+    // dta data buffer
     void send(unsigned long id, unsigned char ext, unsigned char rtr, unsigned char fd, unsigned char len, unsigned char *dta);
     byte checkRecv();
     byte read(unsigned long *id, int *ext, int *rtr, int *fd, int *len, unsigned char *str);
-};
\ No newline at end of file
+};