diff --git a/source/_components/homematic.markdown b/source/_components/homematic.markdown
index dede62718a43..dc5c785a1b55 100644
--- a/source/_components/homematic.markdown
+++ b/source/_components/homematic.markdown
@@ -92,7 +92,7 @@ jsonport:
   required: false
   type: integer
 username:
-  description: When fetching names via JSON-RPC, you need to specify a user with guest-access to the CCU.
+  description: When fetching names via JSON-RPC, you need to specify a user with guest-access to the CCU. Admin-access is required if you work with variables on the CCU.
   required: false
   type: string
 password:
@@ -188,7 +188,7 @@ sensor:
 
 ### {% linkable_title Variables %}
 
-It is possible to read and set values of system variables you have setup on the CCU/Homegear. The supported types for setting values are float- and bool-variables.
+It is possible to read and set values of system variables you have setup on the CCU/Homegear. The supported types for setting values are float- and bool-variables. With the CCU a user with Admin-access is required.
 The states of the variables are available through the attributes of your hub entity (e.g., `homematic.ccu2`). Use templates (as mentioned above) to make your variables available to automations or as entities.
 The values of variables are polled from the CCU/Homegear in an interval of 30 seconds. Setting the value of a variable happens instantly and is directly pushed.