diff --git a/How-to-Unlock-MCU-Flash.md b/How-to-Unlock-MCU-Flash.md
index f9725d1..4ab1b03 100644
--- a/How-to-Unlock-MCU-Flash.md
+++ b/How-to-Unlock-MCU-Flash.md
@@ -32,6 +32,8 @@ If you get funny, unexpected behavior from your board after flashing (see this [
 * Step 3: Click `OK` if you get any error/warning.
 * Step 4: Flash the firmware
 
+You can also try to check WDG_SW option.
+
 # Method 2: Using Ubuntu/Linux
 
 * Step 1: Install the [ST-Flash Utility](https://github.com/texane/stlink)