diff --git a/src/finiteVolume/cfdTools/general/SRF/SRFModel/SRFModel/SRFModel.H b/src/finiteVolume/cfdTools/general/SRF/SRFModel/SRFModel/SRFModel.H
index d10c5adda3..52a72d8b6c 100644
--- a/src/finiteVolume/cfdTools/general/SRF/SRFModel/SRFModel/SRFModel.H
+++ b/src/finiteVolume/cfdTools/general/SRF/SRFModel/SRFModel/SRFModel.H
@@ -75,7 +75,7 @@ protected:
         //- Reference to the mesh
         const fvMesh& mesh_;
 
-        //- Axis of rotation
+        //- Axis of rotation, a direction vector which passes through the origin
         vector axis_;
 
         //- SRF model coeficients dictionary