diff --git a/src/W800_SDK_v1.00.10/app/app_config.h b/src/W800_SDK_v1.00.10/app/app_config.h
index 4a7b840..c715400 100644
--- a/src/W800_SDK_v1.00.10/app/app_config.h
+++ b/src/W800_SDK_v1.00.10/app/app_config.h
@@ -43,6 +43,7 @@
  * @brief i2c
  * 
  */
+#define I2C_CLOCK_SPEED (300000) // 300 kHz seems to be the maximum achievable clock speed before the touch IC behaves funky
 #define I2C_SCL WM_IO_PA_01
 #define I2C_SDA WM_IO_PB_19