diff -r fdca999c0c1a -r ddbf029f5682 runtime/Modbus_config.py
--- a/runtime/Modbus_config.py	Sat Jun 06 07:34:02 2020 +0100
+++ b/runtime/Modbus_config.py	Sat Jun 06 08:50:36 2020 +0100
@@ -93,6 +93,10 @@
 
 
 class MB_Parity(annotate.Choice):
+    # For more info on what this class really does, have a look at the code in
+    # file twisted/nevow/annotate.py
+    # grab this code from $git clone https://github.com/twisted/nevow/
+    # 
     # Warning: do _not_ name this variable choice[] without underscore, as that name is
     # already used for another similar variable by the underlying class annotate.Choice
     _choices = [  0,      1,      2  ]