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 947078b..0b56b94 100644
--- a/How-to-use-keyboard-UART-port-to-flash-firmware.md
+++ b/How-to-use-keyboard-UART-port-to-flash-firmware.md
@@ -3,7 +3,7 @@
 
 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  
+Especially when your keyboard met problem  
 
 here is the process: