diff --git a/include/mrconfig.h b/include/mrconfig.h
index 79ad30a..6422ef3 100644
--- a/include/mrconfig.h
+++ b/include/mrconfig.h
@@ -6,7 +6,7 @@ extern "C" {
 #endif
 
 /**
- * @def Configuration mode
+ * @def Configuration mode.
  */
 #define MR_CFG_DISABLE                  0
 #define MR_CFG_ENABLE                   1
@@ -14,27 +14,27 @@ extern "C" {
 //<------------------------------------ Kernel config ------------------------------------>
 
 /**
- * @def Object name size config
+ * @def Object name size config.
  *
  * Recommend size: 4 * n.
  */
 #define MR_CFG_OBJECT_NAME_SIZE         12
 
 /**
- * @def Debug config
+ * @def Debug config.
  *
- * MR_CFG_DISABLE: Disable debug
- * MR_CFG_ENABLE: Enable debug
+ * MR_CFG_DISABLE: Disable debug.
+ * MR_CFG_ENABLE: Enable debug.
  */
 #define MR_CFG_DEBUG                    MR_CFG_ENABLE
 
 #if (MR_CFG_DEBUG == MR_CFG_ENABLE)
 
 /**
- * @def Debug level config
+ * @def Debug level config.
  *
- * MR_CFG_DISABLE: Disable one
- * MR_CFG_ENABLE: Enable one
+ * MR_CFG_DISABLE: Disable one.
+ * MR_CFG_ENABLE: Enable one.
  */
 #define MR_CFG_DEBUG_ASSERT             MR_CFG_ENABLE
 #define MR_CFG_DEBUG_ERROR              MR_CFG_ENABLE
@@ -45,123 +45,125 @@ extern "C" {
 #endif
 
 /**
- * @def Auto init config
+ * @def Auto init config.
  *
- * MR_CFG_DISABLE: Disable auto init
- * MR_CFG_ENABLE: Enable auto init
+ * MR_CFG_DISABLE: Disable auto init.
+ * MR_CFG_ENABLE: Enable auto init.
  */
 #define MR_CFG_AUTO_INIT                MR_CFG_ENABLE
 
 //<------------------------------------ Device config ------------------------------------>
 
 /**
- * @def Device config
+ * @def Device config.
  *
- * MR_CFG_DISABLE: Disable device
- * MR_CFG_ENABLE: Enable device
+ * MR_CFG_DISABLE: Disable device.
+ * MR_CFG_ENABLE: Enable device.
  */
 #define MR_CFG_DEVICE                   MR_CFG_ENABLE
 
 #if (MR_CFG_DEVICE == MR_CFG_ENABLE)
 
 /**
- * @def Console name config
+ * @def Console name config.
  *
- * Device name, default is "uart1"
+ * Device name, default is "uart1".
  */
 #define MR_CFG_CONSOLE_NAME             "uart1"
 
 /**
- * @def ADC config
+ * @def ADC config.
  *
- * MR_CFG_DISABLE: Disable adc
- * MR_CFG_ENABLE: Enable adc
+ * MR_CFG_DISABLE: Disable adc.
+ * MR_CFG_ENABLE: Enable adc.
  */
 #define MR_CFG_ADC                      MR_CFG_ENABLE
 
 /**
- * @def DAC config
+ * @def DAC config.
  *
- * MR_CFG_DISABLE: Disable dac
- * MR_CFG_ENABLE: Enable dac
+ * MR_CFG_DISABLE: Disable dac.
+ * MR_CFG_ENABLE: Enable dac.
  */
 #define MR_CFG_DAC                      MR_CFG_ENABLE
 
 /**
- * @def I2C config
+ * @def I2C config.
  *
- * MR_CFG_DISABLE: Disable i2c
- * MR_CFG_ENABLE: Enable i2c
+ * MR_CFG_DISABLE: Disable i2c.
+ * MR_CFG_ENABLE: Enable i2c.
  */
 #define MR_CFG_I2C                      MR_CFG_ENABLE
 
 /**
- * @def Pin config
+ * @def Pin config.
  *
- * MR_CFG_DISABLE: Disable pin
- * MR_CFG_ENABLE: Enable pin
+ * MR_CFG_DISABLE: Disable pin.
+ * MR_CFG_ENABLE: Enable pin.
  */
 #define MR_CFG_PIN                      MR_CFG_ENABLE
 
 /**
- * @def PWM config
+ * @def PWM config.
  *
- * MR_CFG_DISABLE: Disable pwm
- * MR_CFG_ENABLE: Enable pwm
+ * MR_CFG_DISABLE: Disable pwm.
+ * MR_CFG_ENABLE: Enable pwm.
  */
 #define MR_CFG_PWM                      MR_CFG_ENABLE
 
 /**
- * @def Serial config
+ * @def Serial config.
  *
- * MR_CFG_DISABLE: Disable serial
- * MR_CFG_ENABLE: Enable serial
+ * MR_CFG_DISABLE: Disable serial.
+ * MR_CFG_ENABLE: Enable serial.
  */
 #define MR_CFG_SERIAL                   MR_CFG_ENABLE
 
 #if (MR_CFG_SERIAL == MR_CFG_ENABLE)
 
 /**
- * @def Serial RX/TX buffer default size
+ * @def Serial RX/TX buffer default size.
  *
- * If the default configuration is not required, set the value to 0
+ * If the default configuration is not required, set the value to 0.
  */
 #define MR_CFG_SERIAL_RX_BUFSZ          32
 #define MR_CFG_SERIAL_TX_BUFSZ          0
 
-/**
- * @def Serial DMA config
- *
- * MR_CFG_DISABLE: Disable serial dma
- * MR_CFG_ENABLE: Enable serial dma
- */
-#define MR_CFG_SERIAL_DMA               MR_CFG_ENABLE
 #endif
 
 /**
- * @def SPI config
+ * @def SPI config.
  *
- * MR_CFG_DISABLE: Disable spi
- * MR_CFG_ENABLE: Enable spi
+ * MR_CFG_DISABLE: Disable spi.
+ * MR_CFG_ENABLE: Enable spi.
  */
 #define MR_CFG_SPI                      MR_CFG_ENABLE
 
 #if (MR_CFG_SPI == MR_CFG_ENABLE)
 
 /**
- * @def SPI RX buffer default size
+ * @def SPI RX buffer default size.
  *
- * If the default configuration is not required, set the value to 0
+ * If the default configuration is not required, set the value to 0.
  */
 #define MR_CFG_SPI_RX_BUFSZ             32
 
+/**
+ * @def SPI TX buffer default size.
+ *
+ * If the default configuration is not required, set the value to 0.
+ *
+ * @note Not yet enabled.
+ */
+#define MR_CFG_SPI_TX_BUFSZ             0
+
 #endif
 
 /**
- * @def Timer config
+ * @def Timer config.
  *
- * MR_CFG_DISABLE: Disable timer
- * MR_CFG_ENABLE: Enable timer
+ * MR_CFG_DISABLE: Disable timer.
+ * MR_CFG_ENABLE: Enable timer.
  */
 #define MR_CFG_TIMER                    MR_CFG_ENABLE
 
@@ -169,6 +171,7 @@ extern "C" {
 
 //<------------------------------------ Module config ------------------------------------>
 
+
 #ifdef __cplusplus
 }
 #endif