diff --git a/README.txt b/README.md
similarity index 90%
rename from README.txt
rename to README.md
index 4dfcbab..8bd49ff 100644
--- a/README.txt
+++ b/README.md
@@ -1,3 +1,5 @@
 This is an Arduino library for the DHT series of low cost temperature/humidity sensors. 
 
-To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder DHT. Check that the DHT folder contains DHT.cpp and DHT.h. Place the DHT library folder your <arduinosketchfolder>/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
\ No newline at end of file
+Tutorial: https://learn.adafruit.com/dht
+
+To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder DHT. Check that the DHT folder contains DHT.cpp and DHT.h. Place the DHT library folder your <arduinosketchfolder>/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
diff --git a/examples/DHTtester/DHTtester.ino b/examples/DHTtester/DHTtester.ino
index f397f0a..ae6c41a 100644
--- a/examples/DHTtester/DHTtester.ino
+++ b/examples/DHTtester/DHTtester.ino
@@ -3,11 +3,11 @@
 
 #include "DHT.h"
 
-#define DHTPIN 2     // what pin we're connected to
+#define DHTPIN 2     // what digital pin we're connected to
 
 // Uncomment whatever type you're using!
 //#define DHTTYPE DHT11   // DHT 11
-#define DHTTYPE DHT22   // DHT 22  (AM2302)
+#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
 //#define DHTTYPE DHT21   // DHT 21 (AM2301)
 
 // Connect pin 1 (on the left) of the sensor to +5V