clarified the pullup

Author: ladyada

examples/DHTtester/DHTtester.pde

@@ -6,13 +6,14 @@
 #define DHTPIN 2     // what pin we're connected to
 
 // Uncomment whatever type you're using!
-//#define DHTTYPE DHT11   // DHT 11 works
+//#define DHTTYPE DHT11   // DHT 11 
 #define DHTTYPE DHT22   // DHT 22  (AM2302)
 //#define DHTTYPE DHT21   // DHT 21 (AM2301)
 
 // Connect pin 1 (on the left) of the sensor to +5V
 // Connect pin 2 of the sensor to whatever your DHTPIN is
 // Connect pin 4 (on the right) of the sensor to GROUND
+// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
 
 DHT dht(DHTPIN, DHTTYPE);