diff --git a/How-to-use-keyboard-UART-port-to-flash-firmware.md b/How-to-use-keyboard-UART-port-to-flash-firmware.md
index ba4b9cf..947078b 100644
--- a/How-to-use-keyboard-UART-port-to-flash-firmware.md
+++ b/How-to-use-keyboard-UART-port-to-flash-firmware.md
@@ -1,3 +1,6 @@
+**All operations are under desktop linux**
+
+
 On uConsole keyboard back,there is a **UART** port which can be used with `stm32flash` to flash keyboard firmware  
 
 Especially at when your keyboard met problem