diff --git a/nano_c_mk1/nano_c_mk1.ino b/nano_c_mk1/nano_c_mk1.ino
index 31555c8..2794fa6 100644
--- a/nano_c_mk1/nano_c_mk1.ino
+++ b/nano_c_mk1/nano_c_mk1.ino
@@ -1,4 +1,4 @@
-#include <Adafruit_ADS1X15.h>
+#include <Adafruit_ADS1X15.h>  // https://github.com/adafruit/Adafruit_ADS1X15
 
 #define WAIT_TIME      1000UL  // default wait time each value read
 #define ADS_MAX        4       // # of analog input pins of an ADS1115
@@ -29,4 +29,4 @@ void loop() {
   Serial.println("]");
   currTime = millis();    
   }
-}
\ No newline at end of file
+}