diff --git a/src/fvOptions/sources/derived/MRFSource/MRFSource.H b/src/fvOptions/sources/derived/MRFSource/MRFSource.H
index 7b5edb189..0ff7d4bb5 100644
--- a/src/fvOptions/sources/derived/MRFSource/MRFSource.H
+++ b/src/fvOptions/sources/derived/MRFSource/MRFSource.H
@@ -73,7 +73,7 @@ protected:
 
     // Protected data
 
-        //- Run-time selectable porosity model
+        //- Run-time selectable MRF model
         autoPtr<MRFZone> mrfPtr_;
 
         //- Velocity field name, default = U