diff --git a/arch/arm/src/stm32f7/Kconfig b/arch/arm/src/stm32f7/Kconfig
index 21fc107d74..f08c216509 100644
--- a/arch/arm/src/stm32f7/Kconfig
+++ b/arch/arm/src/stm32f7/Kconfig
@@ -4692,7 +4692,8 @@ config STM32F7_LTDC_BACKCOLOR
 	default 0x0
 	---help---
 		This is the background color that will be used as the LTDC
-		background layer color.  It is an RGB888 format value.
+		background layer color.  It is an RGB888 format value,
+		which gets written unmodified to register LTDC_BCCR.
 
 config STM32F7_LTDC_DITHER
 	bool "Dither support"