diff --git a/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict b/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
index 5f1331e1243cef042f706e452544766d7c231523..fb583287b45c176d68be59f2103f75a1c006a9c4 100644
--- a/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
+++ b/applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
@@ -196,6 +196,8 @@ castellatedMeshControls
     // - used to determine if surface normals
     //   are roughly the same or opposite. Used e.g. in proximity refinement
     //   and to decide when to merge free-standing baffles
+    //   If e.g. running in surfaceSimplify mode set this to 180 to
+    //   merge all baffles
     //
     // If not specified same as resolveFeatureAngle
     planarAngle 30;