diff --git a/HDQ/hdq.cpp b/HDQ/hdq.cpp
index 1394589..c620f78 100644
--- a/HDQ/hdq.cpp
+++ b/HDQ/hdq.cpp
@@ -1,3 +1,68 @@
+/**
+ * Texas Instruments HDQ implementation for the Arduino API
+ * (cleft) Matthieu Lalonde 2008 (matth@mlalonde.net)
+ * Creative Commons BY-SA-NC
+ * 
+ * http://trac.mlalonde.net/cral/browser/HDQ/
+ * 
+ * Revision 1
+ *
+**/
+
+/* ***************** *
+ * HDQ Usage example *
+** ***************** *
+
+#include "hdq.h"
+HDQ HDQ(HDQ_DEFAULT_PIN);
+
+uint8_t r;
+
+for (uint8_t jj = 0; jj < 0x10; jj++) {
+	r = HDQ.read(jj);
+
+	Serial.print("Register 0x");
+	Serial.print(jj, HEX);
+	Serial.print(": ");
+	Serial.print(r, BIN);
+	Serial.print(" 0x");
+	Serial.println(r, HEX);
+}
+
+r = HDQ.read(0x1e);
+
+Serial.print("Register 0x1e: ");
+Serial.print(r, BIN);
+Serial.print(" 0x");
+Serial.println(r, HEX);
+
+r = HDQ.read(0x7e);
+
+Serial.print("Register 0x7e: ");
+Serial.print(r, BIN);
+Serial.print(" 0x");
+Serial.println(r, HEX);
+
+HDQ.write(0x05, B11011101);
+
+r = HDQ.read(0x05);
+
+Serial.print("Register 0x05: ");
+Serial.print(r, BIN);
+Serial.print(" 0x");
+Serial.println(r, HEX);
+
+HDQ.write(0x05, B00111001);
+
+r = HDQ.read(0x05);
+
+Serial.print("Register 0x05: ");
+Serial.print(r, BIN);
+Serial.print(" 0x");
+Serial.println(r, HEX);
+
+*/
+
 extern "C" {
 	#include "WConstants.h"
 	#include "pins_arduino.h"
@@ -6,11 +71,11 @@ extern "C" {
 #include "avrmacros.h"
 #include "hdq.h"
 
-#define _HDQ_readPin() (*inputReg & bitmask)>>pin /* Change me to inline!*/
+#define _HDQ_readPin() (*inputReg & bitmask)>>pin	/* Change me to inline!*/
 
 /**
  * Constructor
- * @param pin: pin number to attach to
+ * @param pinArg: pin number to attach to
 **/
 HDQ::HDQ(uint8_t pinArg)
 {
diff --git a/HDQ/hdq.h b/HDQ/hdq.h
index 2f759df..50a9e64 100644
--- a/HDQ/hdq.h
+++ b/HDQ/hdq.h
@@ -1,3 +1,14 @@
+/**
+ * Texas Instruments HDQ implementation for the Arduino API
+ * (cleft) Matthieu Lalonde 2008 (matth@mlalonde.net)
+ * Creative Commons BY-SA-NC
+ * 
+ * http://trac.mlalonde.net/cral/browser/HDQ/
+ * 
+ * Revision 1
+ *
+**/
+
 #ifndef _HDQ_H_
 #define _HDQ_H_
 	
@@ -53,7 +64,7 @@
 	public:
 		/**
 		 * Constructor
-		 * @param pin: pin number to attach to
+		 * @param pinArg: pin number to attach to
 		**/
 		HDQ(uint8_t pinArg = HDQ_DEFAULT_PIN);