diff --git a/src/conversion/vtk/output/foamVtkPatchWriter.C b/src/conversion/vtk/output/foamVtkPatchWriter.C
index fcbe032cfd..18764148cd 100644
--- a/src/conversion/vtk/output/foamVtkPatchWriter.C
+++ b/src/conversion/vtk/output/foamVtkPatchWriter.C
@@ -245,7 +245,7 @@ Foam::vtk::patchWriter::patchWriter
     nFaces_(0)
 {
     outputOptions opts(outOpts);
-    opts.append(false);  // No append
+    opts.append(false);  // No append supported
 
     os_.open((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
     format_ = opts.newFormatter(os_);
diff --git a/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.C b/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.C
index df54f039cd..f5ba90efc1 100644
--- a/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.C
+++ b/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.C
@@ -193,7 +193,7 @@ Foam::vtk::surfaceMeshWriter::surfaceMeshWriter
     os_()
 {
     outputOptions opts(outOpts);
-    opts.legacy(true);  // No append supported
+    opts.append(false);  // No append supported
 
     os_.open((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
     format_ = opts.newFormatter(os_);
diff --git a/src/meshTools/output/foamVtkWriteCellSetFaces.C b/src/meshTools/output/foamVtkWriteCellSetFaces.C
index a84b5d5b70..d18eb9f97e 100644
--- a/src/meshTools/output/foamVtkWriteCellSetFaces.C
+++ b/src/meshTools/output/foamVtkWriteCellSetFaces.C
@@ -41,7 +41,7 @@ void Foam::vtk::writeCellSetFaces
 )
 {
     outputOptions opts(outOpts);
-    opts.legacy(true);  // Legacy only, no append
+    opts.legacy(true);  // Legacy only, no xml, no append
 
     const bool legacy_(opts.legacy());
 
diff --git a/src/meshTools/output/foamVtkWriteFaceSet.C b/src/meshTools/output/foamVtkWriteFaceSet.C
index 59c11329d4..26a37e13ec 100644
--- a/src/meshTools/output/foamVtkWriteFaceSet.C
+++ b/src/meshTools/output/foamVtkWriteFaceSet.C
@@ -41,7 +41,7 @@ void Foam::vtk::writeFaceSet
 )
 {
     outputOptions opts(outOpts);
-    opts.legacy(true);  // Legacy only, no append
+    opts.legacy(true);  // Legacy only, no xml, no append
 
     const bool legacy_(opts.legacy());
 
diff --git a/src/meshTools/output/foamVtkWritePointSet.C b/src/meshTools/output/foamVtkWritePointSet.C
index 66cbfc8c44..2cf1e1085b 100644
--- a/src/meshTools/output/foamVtkWritePointSet.C
+++ b/src/meshTools/output/foamVtkWritePointSet.C
@@ -40,7 +40,7 @@ void Foam::vtk::writePointSet
 )
 {
     outputOptions opts(outOpts);
-    opts.legacy(true);  // Legacy only, no append
+    opts.legacy(true);  // Legacy only, no xml, no append
 
     const bool legacy_(opts.legacy());