diff --git a/docs/Compiling_STM32.md b/docs/Compiling_STM32.md
index d75621f..a116108 100644
--- a/docs/Compiling_STM32.md
+++ b/docs/Compiling_STM32.md
@@ -30,14 +30,15 @@ Flashing precompiled **binaries** is done very simple with the cable setup prese
 
 1. In order to compile successfully you need also to modify a maple library file. In ```....\hardware\Arduino_STM32\STM32F1\cores\maple\libmaple\usart_f1.c``` comment out the 2 functions as shown below. This is required to have low-level access to the USART interrupt. <br>
    ```
-   /* 
-   void __irq_usart2(void){
-   usart_irq(&usart2_rb, USART2_BASE);
-   }
-    
-   void __irq_usart3(void) {
-   usart_irq(&usart3_rb, USART3_BASE);
-   } */
+/*
+void __irq_usart2(void) {
+    usart_irq(&usart2_rb, &usart2_wb, USART2_BASE);
+}
+
+void __irq_usart3(void) {
+    usart_irq(&usart3_rb, &usart3_wb, USART3_BASE);
+}
+*/
    ```
 1. Run the IDE, and on the **Tools** menu, select **Board** and then **Boards manager**. <br> Click on the Arduino DUE (32 Bits ARM-Cortex M3) from the list of available boards. You must do this step, it installs the arm-none-eabi-g++ toolchain!
 1. Close and reopen the Arduino IDE and load the Multiprotocol project.