diff --git a/MappingPIDs.png b/MappingPIDs.png
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diff --git a/README.md b/README.md
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@@ -120,6 +120,12 @@ To know the cause of [wake of ESP32](https://docs.espressif.com/projects/esp-idf
 |`int OBD_looping(ObdInfoPid* PIDs, int nbr_elem,int fr_max)`|It is called by the OBD tasks to ask the MPU about certain OBD pids and send data to the SD card|
 |`void CheckObdSpeed(char* label,char* isoTime,int val, int* res)`|Check wether OBD speed leveled off and make ESP32 entreing in deep sleep if the vehicle has stopped|
 
+You can add any other OBD pids in the table declared in `simple_obd_test.ino` just like in the example below:
+
+![MappingPIDs](MappingPIDs.png)
+
+*Mapping pids and their frequencies*
+
 
 
 
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