diff --git a/os/hal/platforms/STM32/platform.dox b/os/hal/platforms/STM32/platform.dox
index 81b95d2c8..342a5ff69 100644
--- a/os/hal/platforms/STM32/platform.dox
+++ b/os/hal/platforms/STM32/platform.dox
@@ -89,10 +89,19 @@
  */
 
 /**
- * @defgroup STM32_SERIAL STM32 USART Support
+ * @defgroup STM32_SERIAL STM32 USART Support (buffered)
  * @brief USART peripherals support.
  * @details The serial driver supports the STM32 USARTs in asynchronous
- *           mode.
+ *          mode.
+ *
+ * @ingroup STM32
+ */
+
+/**
+ * @defgroup STM32_UART STM32 USART Support (unbuffered)
+ * @brief USART peripherals support.
+ * @details The UART driver supports the STM32 USARTs using DMA channels for
+ *          improved performance.
  *
  * @ingroup STM32
  */
@@ -140,4 +149,3 @@
  *
  * @ingroup STM32
  */
-
diff --git a/os/hal/platforms/STM32/stm32_dma.h b/os/hal/platforms/STM32/stm32_dma.h
index 1a3abd389..445e400bb 100644
--- a/os/hal/platforms/STM32/stm32_dma.h
+++ b/os/hal/platforms/STM32/stm32_dma.h
@@ -135,7 +135,7 @@ typedef struct {
  *
  * @param[in] dmap      pointer to a stm32_dma_t structure
  * @param[in] ch        channel number
- * @param[in] cntdr     value to be written in the CNDTR register
+ * @param[in] cndtr     value to be written in the CNDTR register
  * @param[in] cmar      value to be written in the CMAR register
  * @param[in] ccr       value to be written in the CCR register
  */