diff --git a/Documentation/platforms/arm/stm32f4/boards/stm32f401rc-rs485/index.rst b/Documentation/platforms/arm/stm32f4/boards/stm32f401rc-rs485/index.rst
index ae44e18aab7..6b1e703347a 100644
--- a/Documentation/platforms/arm/stm32f4/boards/stm32f401rc-rs485/index.rst
+++ b/Documentation/platforms/arm/stm32f4/boards/stm32f401rc-rs485/index.rst
@@ -16,7 +16,7 @@ STM32F401RCT6 microcontroller.
 
 STM32F401RCT6 microcontroller features:
  - Arm 32-bit Cortex®-M4 CPU with FPU
- - 128 Kbytes of Flash memory
+ - 256 Kbytes of Flash memory
  - 64 Kbytes of SRAM
  - Serial wire debug (SWD) & JTAG interfaces
  - Up to 81 I/O ports with interrupt capability