diff --git a/Porting-to-non-Arduino-Platforms.md b/Porting-to-non-Arduino-Platforms.md
index b5c187f..5a2f2eb 100644
--- a/Porting-to-non-Arduino-Platforms.md
+++ b/Porting-to-non-Arduino-Platforms.md
@@ -8,7 +8,12 @@ The `noarduino.h` file has to define all the platform macros shown in [Custom Bu
 // noarduino.h
 // forward declaration
 void wrap_HAL_GPIO_WritePin(uint8_t pin, uint8_t value);
-#define RADIOLIB_CB_ARGS_DIGITAL_WRITE              (void, wrap_HAL_GPIO_WritePin, uint32_t pin, GPIO_PinState value)
+
+// callback argument macro
+// the first argument is the return type of the wrapper function
+// the second argument is the name of the corresponding Arduino function
+// all other arguments are the arguments of the wrapper function
+#define RADIOLIB_CB_ARGS_DIGITAL_WRITE              (void, digitalWrite, uint32_t pin, GPIO_PinState value)
 
 // noarduino.c/cpp
 // now the implementation - pin number also includes the GPIOx port