diff --git a/changes.txt b/changes.txt
index c33e77d..5895a23 100644
--- a/changes.txt
+++ b/changes.txt
@@ -16,6 +16,7 @@ unreleased, v1.4.0
 - Fixed grammar @KiddieD
 - Fixed infinite loop in example AccessControl.ino @mads256c 
 - Fixed 0-index key ID equals to 0 fails in AccessControl.ino @thoaitrieu
+- Changed type boolean to bool for a more common use @Rotzbua 
 
 22 Mar 2017, v1.3.6
 - Added deprecate and compiler warnings @Rotzbua
diff --git a/examples/AccessControl/AccessControl.ino b/examples/AccessControl/AccessControl.ino
index ffa6a30..07ba3ac 100644
--- a/examples/AccessControl/AccessControl.ino
+++ b/examples/AccessControl/AccessControl.ino
@@ -94,8 +94,8 @@ constexpr uint8_t blueLed = 5;
 constexpr uint8_t relay = 4;     // Set Relay Pin
 constexpr uint8_t wipeB = 3;     // Button pin for WipeMode
 
-boolean programMode = false;  // initialize programming mode to false
-boolean replaceMaster = false;
+bool programMode = false;  // initialize programming mode to false
+bool replaceMaster = false;
 
 uint8_t successRead;    // Variable integer to keep if we have Successful Read from Reader
 
@@ -428,7 +428,7 @@ void deleteID( byte a[] ) {
 }
 
 ///////////////////////////////////////// Check Bytes   ///////////////////////////////////
-boolean checkTwo ( byte a[], byte b[] ) {   
+bool checkTwo ( byte a[], byte b[] ) {   
   for ( uint8_t k = 0; k < 4; k++ ) {   // Loop 4 times
     if ( a[k] != b[k] ) {     // IF a != b then false, because: one fails, all fail
        return false;
@@ -451,7 +451,7 @@ uint8_t findIDSLOT( byte find[] ) {
 }
 
 ///////////////////////////////////////// Find ID From EEPROM   ///////////////////////////////////
-boolean findID( byte find[] ) {
+bool findID( byte find[] ) {
   uint8_t count = EEPROM.read(0);     // Read the first Byte of EEPROM that
   for ( uint8_t i = 1; i < count; i++ ) {    // Loop once for each EEPROM entry
     readID(i);          // Read an ID from EEPROM, it is stored in storedCard[4]
@@ -524,7 +524,7 @@ void successDelete() {
 
 ////////////////////// Check readCard IF is masterCard   ///////////////////////////////////
 // Check to see if the ID passed is the master programing card
-boolean isMaster( byte test[] ) {
+bool isMaster( byte test[] ) {
   if ( checkTwo( test, masterCard ) )
     return true;
   else
diff --git a/examples/MinimalInterrupt/MinimalInterrupt.ino b/examples/MinimalInterrupt/MinimalInterrupt.ino
index a8ef898..52340eb 100644
--- a/examples/MinimalInterrupt/MinimalInterrupt.ino
+++ b/examples/MinimalInterrupt/MinimalInterrupt.ino
@@ -37,7 +37,7 @@ MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
 
 MFRC522::MIFARE_Key key;
 
-volatile boolean bNewInt = false;
+volatile bool bNewInt = false;
 byte regVal = 0x7F;
 void activateRec(MFRC522 mfrc522);
 void clearInt(MFRC522 mfrc522);
diff --git a/examples/RFID-Cloner/RFID-Cloner.ino b/examples/RFID-Cloner/RFID-Cloner.ino
index cf262ea..95985e2 100644
--- a/examples/RFID-Cloner/RFID-Cloner.ino
+++ b/examples/RFID-Cloner/RFID-Cloner.ino
@@ -93,9 +93,9 @@ void dump_byte_array1(byte *buffer, byte bufferSize) {
  * @return true when the given key worked, false otherwise.
  */
  
-boolean try_key(MFRC522::MIFARE_Key *key)
+bool try_key(MFRC522::MIFARE_Key *key)
 {
-    boolean result = false;
+    bool result = false;
     
     for(byte block = 0; block < 64; block++){
       
diff --git a/examples/rfid_default_keys/rfid_default_keys.ino b/examples/rfid_default_keys/rfid_default_keys.ino
index d28c771..dd4b5f4 100644
--- a/examples/rfid_default_keys/rfid_default_keys.ino
+++ b/examples/rfid_default_keys/rfid_default_keys.ino
@@ -75,9 +75,9 @@ void dump_byte_array(byte *buffer, byte bufferSize) {
  *
  * @return true when the given key worked, false otherwise.
  */
-boolean try_key(MFRC522::MIFARE_Key *key)
+bool try_key(MFRC522::MIFARE_Key *key)
 {
-    boolean result = false;
+    bool result = false;
     byte buffer[18];
     byte block = 0;
     MFRC522::StatusCode status;