diff --git a/src/Mod/Fem/App/FemPostFilter.cpp b/src/Mod/Fem/App/FemPostFilter.cpp
index d8b0c620b9..20bfef00d0 100644
--- a/src/Mod/Fem/App/FemPostFilter.cpp
+++ b/src/Mod/Fem/App/FemPostFilter.cpp
@@ -111,6 +111,8 @@ vtkDataObject* FemPostFilter::getInputData() {
 }
 
 
+// ***************************************************************************
+// clip filter
 PROPERTY_SOURCE(Fem::FemPostClipFilter, Fem::FemPostFilter)
 
 FemPostClipFilter::FemPostClipFilter(void) : FemPostFilter() {
@@ -183,6 +185,9 @@ DocumentObjectExecReturn* FemPostClipFilter::execute(void) {
     return Fem::FemPostFilter::execute();
 }
 
+
+// ***************************************************************************
+// data along a line
 PROPERTY_SOURCE(Fem::FemPostDataAlongLineFilter, Fem::FemPostFilter)
 
 FemPostDataAlongLineFilter::FemPostDataAlongLineFilter(void) : FemPostFilter() {
@@ -254,7 +259,6 @@ void FemPostDataAlongLineFilter::handleChangedPropertyType(Base::XMLReader& read
     }
 }
 
-
 void FemPostDataAlongLineFilter::onChanged(const Property* prop) {
     if (prop == &Point1) {
         const Base::Vector3d& vec1 = Point1.getValue();
@@ -324,6 +328,9 @@ void FemPostDataAlongLineFilter::GetAxisData() {
     XAxisData.setValues(coords);
 }
 
+
+// ***************************************************************************
+// data point filter
 PROPERTY_SOURCE(Fem::FemPostDataAtPointFilter, Fem::FemPostFilter)
 
 FemPostDataAtPointFilter::FemPostDataAtPointFilter(void) : FemPostFilter() {
@@ -373,7 +380,6 @@ DocumentObjectExecReturn* FemPostDataAtPointFilter::execute(void) {
     return Fem::FemPostFilter::execute();
 }
 
-
 void FemPostDataAtPointFilter::onChanged(const Property* prop) {
     if (prop == &Center) {
         const Base::Vector3d& vec = Center.getValue();
@@ -420,6 +426,9 @@ void FemPostDataAtPointFilter::GetPointData() {
     PointData.setValues(values);
 }
 
+
+// ***************************************************************************
+// scalar clip filter
 PROPERTY_SOURCE(Fem::FemPostScalarClipFilter, Fem::FemPostFilter)
 
 FemPostScalarClipFilter::FemPostScalarClipFilter(void) : FemPostFilter() {
@@ -475,7 +484,6 @@ DocumentObjectExecReturn* FemPostScalarClipFilter::execute(void) {
     return Fem::FemPostFilter::execute();
 }
 
-
 void FemPostScalarClipFilter::onChanged(const Property* prop) {
 
     if (prop == &Value) {
@@ -521,6 +529,8 @@ void FemPostScalarClipFilter::setConstraintForField() {
 }
 
 
+// ***************************************************************************
+// warp vector filter
 PROPERTY_SOURCE(Fem::FemPostWarpVectorFilter, Fem::FemPostFilter)
 
 FemPostWarpVectorFilter::FemPostWarpVectorFilter(void) : FemPostFilter() {
@@ -540,7 +550,6 @@ FemPostWarpVectorFilter::~FemPostWarpVectorFilter() {
 
 }
 
-
 DocumentObjectExecReturn* FemPostWarpVectorFilter::execute(void) {
 
     std::string val;
@@ -574,7 +583,6 @@ DocumentObjectExecReturn* FemPostWarpVectorFilter::execute(void) {
     return Fem::FemPostFilter::execute();
 }
 
-
 void FemPostWarpVectorFilter::onChanged(const Property* prop) {
 
     if (prop == &Factor) {
@@ -599,6 +607,8 @@ short int FemPostWarpVectorFilter::mustExecute(void) const {
 }
 
 
+// ***************************************************************************
+// cut filter
 PROPERTY_SOURCE(Fem::FemPostCutFilter, Fem::FemPostFilter)
 
 FemPostCutFilter::FemPostCutFilter(void) : FemPostFilter() {
diff --git a/src/Mod/Fem/App/FemPostFunction.cpp b/src/Mod/Fem/App/FemPostFunction.cpp
index 1da8e93f56..0dd14db8fb 100644
--- a/src/Mod/Fem/App/FemPostFunction.cpp
+++ b/src/Mod/Fem/App/FemPostFunction.cpp
@@ -34,7 +34,7 @@ using namespace App;
 
 PROPERTY_SOURCE(Fem::FemPostFunctionProvider, App::DocumentObject)
 
-FemPostFunctionProvider::FemPostFunctionProvider(void): DocumentObject() {
+FemPostFunctionProvider::FemPostFunctionProvider(void) : DocumentObject() {
 
     ADD_PROPERTY(Functions, (nullptr));
 }
@@ -64,12 +64,14 @@ DocumentObjectExecReturn* FemPostFunction::execute(void) {
 }
 
 
+// ***************************************************************************
+// plane function
 PROPERTY_SOURCE(Fem::FemPostPlaneFunction, Fem::FemPostFunction)
 
-FemPostPlaneFunction::FemPostPlaneFunction(void): FemPostFunction() {
+FemPostPlaneFunction::FemPostPlaneFunction(void) : FemPostFunction() {
 
-    ADD_PROPERTY(Origin,(Base::Vector3d(0.0,0.0,0.0)));
-    ADD_PROPERTY(Normal,(Base::Vector3d(0.0,0.0,1.0)));
+    ADD_PROPERTY(Origin, (Base::Vector3d(0.0, 0.0, 0.0)));
+    ADD_PROPERTY(Normal, (Base::Vector3d(0.0, 0.0, 1.0)));
 
     m_plane = vtkSmartPointer<vtkPlane>::New();
     m_implicit = m_plane;
@@ -84,11 +86,11 @@ FemPostPlaneFunction::~FemPostPlaneFunction() {
 
 void FemPostPlaneFunction::onChanged(const Property* prop) {
 
-    if(prop == &Origin) {
+    if (prop == &Origin) {
         const Base::Vector3d& vec = Origin.getValue();
         m_plane->SetOrigin(vec[0], vec[1], vec[2]);
     }
-    else if(prop == &Normal) {
+    else if (prop == &Normal) {
         const Base::Vector3d& vec = Normal.getValue();
         m_plane->SetNormal(vec[0], vec[1], vec[2]);
     }
@@ -102,14 +104,14 @@ void FemPostPlaneFunction::onDocumentRestored() {
 }
 
 
-
-
+// ***************************************************************************
+// sphere function
 PROPERTY_SOURCE(Fem::FemPostSphereFunction, Fem::FemPostFunction)
 
-FemPostSphereFunction::FemPostSphereFunction(void): FemPostFunction() {
+FemPostSphereFunction::FemPostSphereFunction(void) : FemPostFunction() {
 
-    ADD_PROPERTY(Radius,(5));
-    ADD_PROPERTY(Center,(Base::Vector3d(1.0,0.0,0.0)));
+    ADD_PROPERTY(Radius, (5));
+    ADD_PROPERTY(Center, (Base::Vector3d(1.0, 0.0, 0.0)));
 
     m_sphere = vtkSmartPointer<vtkSphere>::New();
     m_implicit = m_sphere;
@@ -124,11 +126,11 @@ FemPostSphereFunction::~FemPostSphereFunction() {
 
 void FemPostSphereFunction::onChanged(const Property* prop) {
 
-    if(prop == &Center) {
+    if (prop == &Center) {
         const Base::Vector3d& vec = Center.getValue();
         m_sphere->SetCenter(vec[0], vec[1], vec[2]);
     }
-    else if(prop == &Radius) {
+    else if (prop == &Radius) {
         m_sphere->SetRadius(Radius.getValue());
     }