diff --git a/plot_samples_high-speed.py b/plot_samples_high-speed.py
index 0d2dfad..eda4185 100644
--- a/plot_samples_high-speed.py
+++ b/plot_samples_high-speed.py
@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 
+# from http://forum.arduino.cc/index.php?topic=137635.msg1270996#msg1270996
+
 import pyqtgraph as pg
 import time, threading, sys
 import serial