diff --git a/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict b/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
index 66df09e5e9..49958bb34f 100644
--- a/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
+++ b/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
@@ -256,7 +256,8 @@ castellatedMeshControls
 
     // Whether any faceZones (as specified in the refinementSurfaces)
     // are only on the boundary of corresponding cellZones or also allow
-    // free-standing zone faces. Not used if there are no faceZones.
+    // free-standing zone faces and zone faces on boundaries. Not used if
+    // there are no faceZones.
     allowFreeStandingZoneFaces true;