diff --git a/demos/ARMCM4-STM32F407-LWIP/main.c b/demos/ARMCM4-STM32F407-LWIP/main.c
index 39f94b9a1..4ef577da8 100644
--- a/demos/ARMCM4-STM32F407-LWIP/main.c
+++ b/demos/ARMCM4-STM32F407-LWIP/main.c
@@ -58,7 +58,7 @@ int main(void) {
   chSysInit();
 
   /*
-   * Activates the serial driver 3 using the driver default configuration.
+   * Activates the serial driver 6 using the driver default configuration.
    */
   sdStart(&SD6, NULL);