diff --git a/alphainnotec/README.md b/alphainnotec/README.md
index ae540d4..9cc8557 100644
--- a/alphainnotec/README.md
+++ b/alphainnotec/README.md
@@ -1,6 +1,12 @@
 # alpha innotec
 
-Connect nymea to alpha innotec heat pumps.
+Connect nymea to alpha innotec heat pumps. 
+
+In order to use the modbus interface, it is important to enable modbus on the heatpump using the Windows tools from Alpha Innotec. 
+The instructions for that can be found in the user manual of the heat pump. 
+
+Please also make sure all values are configured as readable and writable for modbus, otherwise the heapump can only be monitored, but
+not optimized for smart heating. 
 
 ## Supported Things
 
@@ -10,6 +16,7 @@ Connect nymea to alpha innotec heat pumps.
 
 * The package 'nymea-plugin-alphainnotec' must be installed
 * Both devices must be in the same local area network.
+* Modbus enabled and all values are readable and writable.
 
 ## More