diff --git a/app/driver/i2c_master.c b/app/driver/i2c_master.c
index a1234887f6..b3ec4869da 100644
--- a/app/driver/i2c_master.c
+++ b/app/driver/i2c_master.c
@@ -51,12 +51,12 @@
 // enable use GPIO16 (D0) pin as SCL line
 #ifdef I2C_MASTER_GPIO16_ENABLE
 #define IS_PIN16(n) ((n)==16)
-// CPU_CYCLES_BETWEEN_DELAYS describes how much cpu cycles code runs 
+// CPU_CYCLES_BETWEEN_DELAYS describes how much cpu cycles code runs
 // between i2c_master_setDC() calls if delay is zero and i2c_master_set_DC_delay()
 // is not being called. This is not exact value, but proportional with length of code.
 // Increasing the value results in less delay and faster i2c clock speed.
 #define CPU_CYCLES_BETWEEN_DELAYS 80
-// CPU_CYCLES_GPIO16 is added to CPU_CYCLES_BETWEEN_DELAYS, 
+// CPU_CYCLES_GPIO16 is added to CPU_CYCLES_BETWEEN_DELAYS,
 // as RTC-related IO takes much more time than standard GPIOs.
 // Increasing the value results in less delay and faster i2c clock speed for GPIO16.
 #define CPU_CYCLES_GPIO16 90
@@ -64,7 +64,7 @@
 #else
 // If GPIO16 support is not enabled, remove GPIO16-related code during compile
 // and change timing constants.
-#define IS_PIN16(n) (0) 
+#define IS_PIN16(n) (0)
 #define CPU_CYCLES_BETWEEN_DELAYS 74
 #endif //I2C_MASTER_GPIO16_ENABLE
 
@@ -275,7 +275,7 @@ i2c_master_setup(uint16 id, uint8 sda, uint8 scl, uint32 speed)
     ETS_GPIO_INTR_DISABLE(); //disable gpio interrupts
 
     if (IS_PIN16(i2c[id]->pin_SCL)){ //if GPIO16
-        CLEAR_PERI_REG_MASK(PAD_XPD_DCDC_CONF, 0x43); //disable all functions for XPD_DCDC 
+        CLEAR_PERI_REG_MASK(PAD_XPD_DCDC_CONF, 0x43); //disable all functions for XPD_DCDC
         SET_PERI_REG_MASK(PAD_XPD_DCDC_CONF, 0x1); // select function RTC_GPIO0 for pin XPD_DCDC
         CLEAR_PERI_REG_MASK(RTC_GPIO_CONF, 0x1); //mux configuration for out enable
         SET_PERI_REG_MASK(RTC_GPIO_ENABLE, 0x1); //out enable
@@ -347,7 +347,7 @@ i2c_master_readByte(uint16 id, sint16 ack)
     sint8 i;
     //invert and clamp ACK to 0/1, because ACK == 1 for i2c means SDA in low state
     uint8 ackLevel = (ack ? 0 : 1);
-    
+
     i2c_master_setDC(id, i2c[id]->last_SDA, 0);
     i2c_master_setDC(id, 1, 0);
     for (i = 7; i >= 0; i--) {
@@ -448,7 +448,7 @@ i2c_master_setDC(uint8 SDA, uint8 SCL)
         I2C_MASTER_SDA_HIGH_SCL_LOW();
     } else {
         I2C_MASTER_SDA_HIGH_SCL_HIGH();
-    }    
+    }
 
     if(1 == SCL) {
         do {
@@ -517,7 +517,7 @@ i2c_master_configured(uint16 id)
  * FunctionName : i2c_master_setup
  * Description  : config SDA and SCL gpio to open-drain output mode,
  *                mux and gpio num defined in i2c_master.h
- * Parameters   : bus id, uint8 sda, uint8 scl, uint32 speed 
+ * Parameters   : bus id, uint8 sda, uint8 scl, uint32 speed
  * Returns      : configured speed
 *******************************************************************************/
 uint32 ICACHE_FLASH_ATTR
@@ -589,7 +589,7 @@ i2c_master_readByte(uint16 id, sint16 ack)
     uint8 retVal = 0;
     uint8 k, i;
     uint8 ackLevel = (ack ? 0 : 1);
-    
+
     i2c_master_wait(5);
     i2c_master_setDC(m_nLastSDA, 0);
 
@@ -632,7 +632,7 @@ i2c_master_writeByte(uint16 id, uint8 wrdata)
     uint8 dat;
     sint8 i;
     uint8 retVal;
-    
+
     i2c_master_wait(5);
 
     i2c_master_setDC(m_nLastSDA, 0);
diff --git a/docs/modules/i2c.md b/docs/modules/i2c.md
index 207ec33f86..94ba23557a 100644
--- a/docs/modules/i2c.md
+++ b/docs/modules/i2c.md
@@ -1,8 +1,8 @@
 # I²C Module
 | Since  | Origin / Contributor  | Maintainer  | Source  |
 | :----- | :-------------------- | :---------- | :------ |
-| 2014-12-22 | [Zeroday](https://github.com/funshine) | [Zeroday](https://github.com/funshine) | [i2c.c](../../../app/modules/i2c.c)|
-| 2018-08-30 | [Natalia Sorokina](https://github.com/sonaux) |  | [i2c_master.c](../../../app/driver/i2c_master.c)|
+| 2014-12-22 | [Zeroday](https://github.com/funshine) | [Zeroday](https://github.com/funshine) | [i2c.c](../../app/modules/i2c.c)|
+| 2018-08-30 | [Natalia Sorokina](https://github.com/sonaux) |  | [i2c_master.c](../../app/driver/i2c_master.c)|
 
 I²C (I2C, IIC) is a serial 2-wire bus for communicating with various devices. Also known as SMBus or TWI, though SMBus have some additions to the I2C protocol.
 ESP8266 chip does not have hardware I²C, so module uses software I²C driver.
@@ -15,14 +15,14 @@ This module supports:
  - Clock stretching (slow slave device can tell the master to wait)
  - Sharing SDA line over multiple I²C buses to save available pins
  - GPIO16 pin can be used as SCL pin, but selected bus will be limited to not more than FAST speed.
-  
+
  HIGH-speed mode (3.5MHz clock) and 10-bit addressing scheme is not supported.
 
 You have to call `i2c.setup` on a given I²C bus at least once before communicating to any device connected to that bus, otherwise you will get an error.
 
 I²C bus designed to work in open-drain mode, so it needs pull-up resistors 1k - 10k on SDA and SCL lines. Though many peripheral modules have pull-up resistors onboard and will work without additional external resistors.
 
-Hint for using many identical devices with same address: 
+Hint for using many identical devices with same address:
 Many devices allow to choose between 2 I²C addresses via pin or soldered 0 Ohm resistor.
 If address change is not an option or you need to use more than 2 similar devices, you can use different I²C buses.
 Initialize them once by calling `i2c.setup` with different bus numbers and pins, then refer to each device by bus id and device address.