diff --git a/Adafruit_MCP23017.cpp b/Adafruit_MCP23017.cpp
index aba5e0b..b8f6f82 100644
--- a/Adafruit_MCP23017.cpp
+++ b/Adafruit_MCP23017.cpp
@@ -116,6 +116,23 @@ void Adafruit_MCP23017::begin(uint8_t addr) {
 	writeRegister(MCP23017_IODIRB,0xff);
 }
 
+/**
+ * Initializes the MCP23017 given its HW selected address, see datasheet for Address selection.
+ */
+void Adafruit_MCP23017::begin(uint8_t addr, uint8_t sda_pin, uint8_t scl_pin) {
+	if (addr > 7) {
+		addr = 7;
+	}
+	i2caddr = addr;
+
+	Wire.begin(sda_pin, scl_pin);
+
+	// set defaults!
+	// all inputs on port A and B
+	writeRegister(MCP23017_IODIRA,0xff);
+	writeRegister(MCP23017_IODIRB,0xff);
+}
+
 /**
  * Initializes the default MCP23017, with 000 for the configurable part of the address
  */
diff --git a/Adafruit_MCP23017.h b/Adafruit_MCP23017.h
index 3793aec..6e5d9dd 100644
--- a/Adafruit_MCP23017.h
+++ b/Adafruit_MCP23017.h
@@ -31,6 +31,7 @@
 class Adafruit_MCP23017 {
 public:
   void begin(uint8_t addr);
+  void begin(uint8_t addr, uint8_t sda_pin, uint8_t scl_pin);
   void begin(void);
 
   void pinMode(uint8_t p, uint8_t d);