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-rw-r--r--docs/serial_driver.md1
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diff --git a/docs/serial_driver.md b/docs/serial_driver.md
index bc376b6ddd..c98f4c1176 100644
--- a/docs/serial_driver.md
+++ b/docs/serial_driver.md
@@ -60,6 +60,7 @@ Configure the hardware via your config.h:
// 5: about 19200 baud
#define SERIAL_USART_DRIVER SD1 // USART driver of TX pin. default: SD1
#define SERIAL_USART_TX_PAL_MODE 7 // Pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 7
+#define SERIAL_USART_TIMEOUT 100 // USART driver timeout. default 100
```
You must also enable the ChibiOS `SERIAL` feature: