diff --git a/README.md b/README.md
index 95241bc..67d822c 100644
--- a/README.md
+++ b/README.md
@@ -14,11 +14,11 @@ Pino led(13, Pino::Mode::out);    // select the pin for the LED
 void setup() {}
 
 void loop() {
-  int sensorValue = sensor.read();
+  auto sensorValue = sensor.read();
   led.on();
   // stop the program for <sensorValue> milliseconds:
   delay(sensorValue);
-  led.off();;
+  led.off();
   // stop the program for for <sensorValue> milliseconds:
   delay(sensorValue);
 }
@@ -113,7 +113,7 @@ The table below shows the corresponding class methods to native functions:
 | `pin.shiftIn(clockPin)`      |`shiftIn(pin, clockPin, MSBFIRST)`|
 | `pin.shiftInRe(clockPin)`      |`shiftIn(pin, clockPin, LSBFIRST)`|
 
-More details see [surce code](Pino.h)
+More details see [surce code](src/Pino.h)
 
 
 ![Pino](/extras/Pino.png?raw=true)
diff --git a/src/Pino.h b/src/Pino.h
index fc041fd..4cc49c6 100644
--- a/src/Pino.h
+++ b/src/Pino.h
@@ -98,7 +98,8 @@ class Pino
         ::tone(_pin, frequency, duration);
     }
 
-    // Stops the generation of a square wave triggered by tone(). Has no effect if no tone is being generated.
+    // Stops the generation of a square wave triggered by tone().
+    // Has no effect if no tone is being generated.
     void noTone() const
     {
         ::noTone(_pin);
@@ -107,21 +108,21 @@ class Pino
     // Reads a pulse HIGH on the pin.
     uint32_t pulseInOn(uint32_t timeout) const
     {
-        return pulseIn(_pin, HIGH, timeout);
+        return ::pulseIn(_pin, HIGH, timeout);
     }
     uint32_t pulseInOn() const
     {
-        return pulseIn(_pin, HIGH);
+        return ::pulseIn(_pin, HIGH);
     }
 
-    // // Reads a pulse HIGH on the pin.
+    // Reads a pulse HIGH on the pin.
     uint32_t pulseInOff(uint32_t timeout) const
     {
-        return pulseIn(_pin, LOW, timeout);
+        return ::pulseIn(_pin, LOW, timeout);
     }
     uint32_t pulseInOff() const
     {
-        return pulseIn(_pin, LOW);
+        return ::pulseIn(_pin, LOW);
     }
 
     // Shifts out a byte of data one bit at a time
@@ -166,6 +167,7 @@ class Pino
         return ::shiftIn(_pin, clockPin._pin, LSBFIRST);
     }
 
+    // Cast to a number
     operator uint8_t () const
     {
         return _pin;