diff --git a/src/fvOptions/sources/derived/MRFSource/MRFSource.C b/src/fvOptions/sources/derived/MRFSource/MRFSource.C
index d9b4a2a9b94b35b2437384a300d0e6466c084c0d..5dc8ba9fbe63663b62581259fe94085ce83fdc34 100644
--- a/src/fvOptions/sources/derived/MRFSource/MRFSource.C
+++ b/src/fvOptions/sources/derived/MRFSource/MRFSource.C
@@ -52,7 +52,7 @@ void Foam::fv::MRFSource::initialise()
     if (selectionMode_ != smCellZone)
     {
         FatalErrorIn("void Foam::MRFSource::initialise()")
-            << "The porosity region must be specified as a cellZone.  Current "
+            << "The MRF region must be specified as a cellZone. Current "
             << "selection mode is " << selectionModeTypeNames_[selectionMode_]
             << exit(FatalError);
     }