diff --git a/IRremote.h b/IRremote.h
index fe1a870..4ce810e 100644
--- a/IRremote.h
+++ b/IRremote.h
@@ -270,6 +270,7 @@ class IRsend
 		//......................................................................
 #		if SEND_RC5
 			void  sendRC5        (unsigned long data,  int nbits) ;
+			void  sendRC5ext     (unsigned long addr, unsigned long cmd, boolean toggle);
 #		endif
 #		if SEND_RC6
 			void  sendRC6        (unsigned long data,  int nbits) ;
diff --git a/changelog.md b/changelog.md
index a3adbfe..3435389 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,8 +1,5 @@
-## 3.0.0 - 2017/09/14
-- Changed default send pin on ATmega32u4 from 13 to 9.
-	Note: this is a non-backwards compatible change as the behaviour of existing programs using this board for receiving WILL be affected. If you would like to use pin 13 as before then please search src/boarddefs.h for "32u4" and comment the line for pin 9 while uncommenting the line for pin 13
-
-
+## 2.4.3
+- Added Philips Extended RC-5 protocol support [PR #522] (https://github.com/z3t0/Arduino-IRremote/pull/522)
 
 ## 2.3.3 - 2017/03/31
 - Added ESP32 IR receive support [PR #427](https://github.com/z3t0/Arduino-IRremote/pull/425)
diff --git a/ir_RC5_RC6.cpp b/ir_RC5_RC6.cpp
index 10e7927..e16a334 100644
--- a/ir_RC5_RC6.cpp
+++ b/ir_RC5_RC6.cpp
@@ -78,6 +78,73 @@ void  IRsend::sendRC5 (unsigned long data,  int nbits)
 
 	space(0);  // Always end with the LED off
 }
+
+void  IRsend::sendRC5ext (unsigned long addr, unsigned long cmd, boolean toggle)
+{
+	// Set IR carrier frequency
+	enableIROut(36);
+	
+	unsigned long addressBits = 5;
+	unsigned long commandBits = 7;
+	unsigned long nbits = addressBits + commandBits;
+	
+	// Start
+	mark(RC5_T1);
+	
+	// Bit #6 of the command part, but inverted!
+	unsigned long cmdBit6 = (1UL << (commandBits-1)) & cmd;
+	if (cmdBit6) {
+		// Inverted (1 -> 0 = mark-to-space)
+		mark(RC5_T1);
+		space(RC5_T1);
+	} else {
+		space(RC5_T1);
+		mark(RC5_T1);
+	}
+	commandBits--;
+
+	// Toggle bit
+	static int toggleBit = 1;
+	if (toggle) {
+		if (toggleBit == 0) {
+			toggleBit = 1;
+		} else {
+			toggleBit = 0;
+		}
+	}
+	if (toggleBit) {
+		space(RC5_T1);
+		mark(RC5_T1);
+	} else {
+		mark(RC5_T1);
+		space(RC5_T1);
+	}
+
+	// Address
+	for (unsigned long  mask = 1UL << (addressBits - 1);  mask;  mask >>= 1) {
+		if (addr & mask) {
+			space(RC5_T1); // 1 is space, then mark
+			mark(RC5_T1);
+		} else {
+			mark(RC5_T1);
+			space(RC5_T1);
+		}
+	}
+	
+	// Command
+	for (unsigned long  mask = 1UL << (commandBits - 1);  mask;  mask >>= 1) {
+		if (cmd & mask) {
+			space(RC5_T1); // 1 is space, then mark
+			mark(RC5_T1);
+		} else {
+			mark(RC5_T1);
+			space(RC5_T1);
+		}
+	}
+
+	space(0);  // Always end with the LED off
+}
+
 #endif
 
 //+=============================================================================