diff --git a/Config_Controller.md b/Config_Controller.md
index 8529e91..6e0710b 100644
--- a/Config_Controller.md
+++ b/Config_Controller.md
@@ -74,7 +74,7 @@ All further parameters are passed to the specific controller code without checki
  **Default**: "ControlLoop"
 
 **Sensor3Name**::<BR>
-&emsp;String value that defines ??? <BR>
+&emsp;String value that defines the module name in the Orchestra configuration for the Z-axis interferometer.<BR>
 &emsp;**Default**: "AttoCube_Sensor"
 
 **nAxes**::<BR>