diff --git a/Compile-keyboard-bootloader.md b/Compile-keyboard-bootloader.md
index 985e353..53fe2b5 100644
--- a/Compile-keyboard-bootloader.md
+++ b/Compile-keyboard-bootloader.md
@@ -35,7 +35,8 @@ srec_cat bootloader_only_binaries/generic_boot20_pc13.bin -Binary -offset 0x0800
 
 # Flash Arudino 
 ## Arduino IDE
-* add stm32duino pacakage index: http://dan.drown.org/stm32duino/package_STM32duino_index.json  
+* add stm32duino pacakage index in **Preference panel** : http://dan.drown.org/stm32duino/package_STM32duino_index.json  and install STM32F1xx/GD32F1xx boards
+
 ![image](https://user-images.githubusercontent.com/523580/192196432-7afdbda3-3de6-4ca1-bd18-dbcc6b38b295.png)
 
 * verbose all outputs: