diff --git a/arch/arm/src/stm32h7/stm32h7x3xx_rcc.c b/arch/arm/src/stm32h7/stm32h7x3xx_rcc.c
index 49f8d495f5..9218861409 100644
--- a/arch/arm/src/stm32h7/stm32h7x3xx_rcc.c
+++ b/arch/arm/src/stm32h7/stm32h7x3xx_rcc.c
@@ -486,7 +486,7 @@ static inline void rcc_enableapb2(void)
 #endif
 
 #ifdef CONFIG_STM32H7_USART6
-  /* USART1 clock enable */
+  /* USART6 clock enable */
 
   regval |= RCC_APB2ENR_USART6EN;
 #endif
diff --git a/arch/arm/src/stm32h7/stm32h7x7xx_rcc.c b/arch/arm/src/stm32h7/stm32h7x7xx_rcc.c
index af179c506d..81e7e8a627 100644
--- a/arch/arm/src/stm32h7/stm32h7x7xx_rcc.c
+++ b/arch/arm/src/stm32h7/stm32h7x7xx_rcc.c
@@ -486,7 +486,7 @@ static inline void rcc_enableapb2(void)
 #endif
 
 #ifdef CONFIG_STM32H7_USART6
-  /* USART1 clock enable */
+  /* USART6 clock enable */
 
   regval |= RCC_APB2ENR_USART6EN;
 #endif