diff --git a/arch/arm/src/stm32h7/Kconfig b/arch/arm/src/stm32h7/Kconfig
index b013849204d..12d8def5abe 100644
--- a/arch/arm/src/stm32h7/Kconfig
+++ b/arch/arm/src/stm32h7/Kconfig
@@ -325,8 +325,8 @@ config USART1_RXFIFO_THRES
 		  5 -> Full
 
 		Higher values mean lower interrupt rates and better CPU performance.
-		Lower values are need at high BAUD rates to prevent Rx data overrun
-		errors.
+		Lower values may be needed at high BAUD rates to prevent Rx data
+		overrun errors.
 
 endif # STM32H7_USART1
 
@@ -363,8 +363,8 @@ config USART2_RXFIFO_THRES
 		  5 -> Full
 
 		Higher values mean lower interrupt rates and better CPU performance.
-		Lower values are need at high BAUD rates to prevent Rx data overrun
-		errors.
+		Lower values may be needed at high BAUD rates to prevent Rx data
+		overrun errors.
 
 endif # STM32H7_USART2
 
@@ -401,8 +401,8 @@ config USART3_RXFIFO_THRES
 		  5 -> Full
 
 		Higher values mean lower interrupt rates and better CPU performance.
-		Lower values are need at high BAUD rates to prevent Rx data overrun
-		errors.
+		Lower values may be needed at high BAUD rates to prevent Rx data
+		overrun errors.
 
 endif # STM32H7_USART3
 
@@ -439,8 +439,8 @@ config UART4_RXFIFO_THRES
 		  5 -> Full
 
 		Higher values mean lower interrupt rates and better CPU performance.
-		Lower values are need at high BAUD rates to prevent Rx data overrun
-		errors.
+		Lower values may be needed at high BAUD rates to prevent Rx data
+		overrun errors.
 
 endif # STM32H7_UART4
 
@@ -477,8 +477,8 @@ config UART5_RXFIFO_THRES
 		  5 -> Full
 
 		Higher values mean lower interrupt rates and better CPU performance.
-		Lower values are need at high BAUD rates to prevent Rx data overrun
-		errors.
+		Lower values may be needed at high BAUD rates to prevent Rx data
+		overrun errors.
 
 endif # STM32H7_UART5
 
@@ -515,8 +515,8 @@ config USART6_RXFIFO_THRES
 		  5 -> Full
 
 		Higher values mean lower interrupt rates and better CPU performance.
-		Lower values are need at high BAUD rates to prevent Rx data overrun
-		errors.
+		Lower values may be needed at high BAUD rates to prevent Rx data
+		overrun errors.
 
 endif # STM32H7_USART
 
@@ -553,8 +553,8 @@ config UART7_RXFIFO_THRES
 		  5 -> Full
 
 		Higher values mean lower interrupt rates and better CPU performance.
-		Lower values are need at high BAUD rates to prevent Rx data overrun
-		errors.
+		Lower values may be needed at high BAUD rates to prevent Rx data
+		overrun errors.
 
 endif # STM32H7_UART7
 
@@ -591,8 +591,8 @@ config UART8_RXFIFO_THRES
 		  5 -> Full
 
 		Higher values mean lower interrupt rates and better CPU performance.
-		Lower values are need at high BAUD rates to prevent Rx data overrun
-		errors.
+		Lower values may be needed at high BAUD rates to prevent Rx data
+		overrun errors.
 
 endif # STM32H7_UART8
 
diff --git a/arch/arm/src/stm32h7/stm32_serial.c b/arch/arm/src/stm32h7/stm32_serial.c
index f18dfda6e8f..897114de661 100644
--- a/arch/arm/src/stm32h7/stm32_serial.c
+++ b/arch/arm/src/stm32h7/stm32_serial.c
@@ -1207,7 +1207,7 @@ static int up_setup(struct uart_dev_s *dev)
   regval  = up_serialin(priv, STM32_USART_CR3_OFFSET);
   regval &= ~(USART_CR3_CTSIE | USART_CR3_CTSE | USART_CR3_RTSE | USART_CR3_EIE);
 
-  /* Set Rx FIFO threshold to empty */
+  /* Set Rx FIFO threshold to the configured level */
 
   regval |= USART_CR3_RXFTCFG(priv->rxftcfg);
 
diff --git a/configs/metro-m4/README.txt b/configs/metro-m4/README.txt
index b0b2c563630..e49ba034093 100644
--- a/configs/metro-m4/README.txt
+++ b/configs/metro-m4/README.txt
@@ -86,7 +86,7 @@ STATUS
   2018-09-01:  I found a workaround by substituting OSCULP32K for XOSC32
     as the source to GCLK3.   With that workaround, the port gets past all
     clock and USART  configuration.  A new configuration option was added,
-    CONFIG_METRO_M4_32KHZXTAL. By default this workaround is in place.
+    CONFIG_METRO_M4_32KHZXTAL.  By default this workaround is in place.
     But you can enable CONFIG_METRO_M4_32KHZXTAL if you want to further
     study the XOSC32K problem.