diff --git a/src/radiationModels/derivedFvPatchFields/MarshakRadiationFixedTemperature/MarshakRadiationFixedTemperatureFvPatchScalarField.H b/src/radiationModels/derivedFvPatchFields/MarshakRadiationFixedTemperature/MarshakRadiationFixedTemperatureFvPatchScalarField.H
index 6c6f4b64a5..1d235093b2 100644
--- a/src/radiationModels/derivedFvPatchFields/MarshakRadiationFixedTemperature/MarshakRadiationFixedTemperatureFvPatchScalarField.H
+++ b/src/radiationModels/derivedFvPatchFields/MarshakRadiationFixedTemperature/MarshakRadiationFixedTemperatureFvPatchScalarField.H
@@ -34,7 +34,7 @@ Description
 Usage
     \table
         Property     | Description             | Required    | Default value
-        T            | temperature field name  | no          | T
+        Trad         | radiation temperature field  | yes         |
     \endtable
 
     Example of the boundary condition specification: