diff --git a/drivers/drivers/pqwsw2.py b/drivers/drivers/pqwsw2.py
index 9d6b7081ffe057a547c77507fe88af8aa07096c0..0a8ca6d9d8ba6b4887d753570edea16e2fa8c1f6 100644
--- a/drivers/drivers/pqwsw2.py
+++ b/drivers/drivers/pqwsw2.py
@@ -1,6 +1,8 @@
 import requests
 import json
 
+#see: https://api.mystrom.ch/
+
 class PQWSW2:
     def __init__(self, device_ip):
         self.device_ip = device_ip