diff --git a/sinqEPICSApp/src/NanotecDriver.cpp b/sinqEPICSApp/src/NanotecDriver.cpp
index db25f8c..45c2c40 100644
--- a/sinqEPICSApp/src/NanotecDriver.cpp
+++ b/sinqEPICSApp/src/NanotecDriver.cpp
@@ -3,6 +3,14 @@ FILENAME... NanotecDriver.cpp
 USAGE...    Motor driver support for the Nanotec SMCI controllers 
             connected to a RS-485 bus.
 
+These motors sit on a bus. The address on the bus is a random number, not 
+necessarily the motor number. These asyn motor drivers do not have access to 
+the motor record. Thus it was impossible to pass the bus address through. 
+The option was to create an axiliary record but this sucked too because the 
+bus address a motor is an initialisation parameter and should not be visible 
+in the EPICS database. Thus I choose to pass the bus address as a comma separated 
+list to the motor controller constructor.  
+
 Mark Koennecke
 July 2015