diff --git a/README.md b/README.md
index 1c71864..58937f7 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,24 @@
 # W800_Smart_Watch
-## A Smart Watch project using the Chinese W800 MCU.
+## Why this project :
 
+## A Smart Watch project using the Chinese W800 SOC.
+The W800 is a pretty interesting chip with impressive characterics :  
+Core :  
+* 32bit XT804
+* 240 Mhz frequency
+Memory :
+* 2 MB on board flash
+* 288 KB RAM
+Wireless :
+* Bluetooth EDR(Classic) and BLE 4.2
+* WiFi 2.4Ghz 802.11 b/g/n
+
+
+## Sensors :
+The goal is to embed the following sensors in the watch :
+* An accelerometer (for wrist tilt detection, single and double tap detection and more)
+* A magnetometer
+* An air pressure/temperature sensor
 
 ## MCU Pin assignement table :
 | Pin Number | Pin Name | Type | Function | Pull UP/DOWN| Connected to | Comment |
@@ -19,7 +37,7 @@
 ||TEST|I|Test function configuration pin||||
 ||BOOTMODE|I/O|BOOTMODE and I²S_MCLK/LSPI_CS/PWM2/I²S_DO|U/D|||
 ||PA_1|I/O|JTAG_CK/I²C_SCL/PWM3/I²S_LRCK/**ADC0**|U/D|||
-||PA_4|I/O|JTAG_SWO/I²C_SDA/PWM4/I²S_BCK/ADC1 |U/D|||
+||PA_4|I/O|JTAG_SWO/I²C_SDA/**PWM4**/I²S_BCK/ADC1 |U/D|||
 ||PA_7|I/O|PWM4/LSPI_MOSI/I²S_MCK/I²S_DI/Touch0|U/D|||
 ||VDD3V3IO|P|IO power supply, 3.3V||||
 ||PB_0|I/O|PWM0/LSPI_MISO/UART3_TX/PSRAM_CK/Touch3|U/D|||
@@ -30,8 +48,8 @@
 ||PB_5|I/O|LSPI_MOSI/UART2_CTS/UART4_RX/PSRAM_D3/Touch8|U/D|||
 ||VDD3V3IO|P|IO power supply, 3.3V||||
 ||CAP|I|External capacitor, 4.7µF||||
-||PB_6|I/O|UART1_TX/MMC_CLK/HSPI_CK/SDIO_CK/Touch9|U/D|||
-||PB_7|I/O|UART1_RX/MMC_CMD/HSPI_INT/SDIO_CMD/Touch10|U/D|||
+||PB_6|I/O|UART1_TX/**MMC_CLK**/HSPI_CK/SDIO_CK/Touch9|U/D|||
+||PB_7|I/O|UART1_RX/**MMC_CMD**/HSPI_INT/SDIO_CMD/Touch10|U/D|||
 ||PB_8|I/O|I²S_BCK/MMC_D0/PWM_BREAK/SDIO_D0/Touch11|U/D|||
 ||PB_9|I/O|I²S_LRCK/MMC_D1/HSPI_CS/SDIO_D1/Touch12|U/D|||
 ||PB_10|I/O|I²S_DI/MMC_D2/HSPI_DI/SDIO_D2|U/D|||