diff --git a/src/Mod/Sketcher/Gui/TaskSketcherValidation.cpp b/src/Mod/Sketcher/Gui/TaskSketcherValidation.cpp
index ea179d8be..828760935 100644
--- a/src/Mod/Sketcher/Gui/TaskSketcherValidation.cpp
+++ b/src/Mod/Sketcher/Gui/TaskSketcherValidation.cpp
@@ -36,9 +36,16 @@
 # include <Inventor/nodes/SoShapeHints.h>
 #endif
 
+#include <BRep_Tool.hxx>
+#include <gp_Pnt.hxx>
 #include <Precision.hxx>
 #include <TopTools_IndexedMapOfShape.hxx>
+#include <TopTools_IndexedDataMapOfShapeListOfShape.hxx>
+#include <TopExp.hxx>
 #include <TopExp_Explorer.hxx>
+#include <TopoDS.hxx>
+#include <TopoDS_Edge.hxx>
+#include <TopoDS_Vertex.hxx>
 #include <algorithm>
 
 #include "ui_TaskSketcherValidation.h"
@@ -318,6 +325,28 @@ void SketcherValidation::on_fixButton_clicked()
     doc->recompute();
 }
 
+void SketcherValidation::on_highlightButton_clicked()
+{
+    std::vector<Base::Vector3d> points;
+    TopoDS_Shape shape = sketch->Shape.getValue();
+
+    // build up map vertex->edge
+    TopTools_IndexedDataMapOfShapeListOfShape vertex2Edge;
+    TopExp::MapShapesAndAncestors(shape, TopAbs_VERTEX, TopAbs_EDGE, vertex2Edge);
+    for (int i=1; i<= vertex2Edge.Extent(); ++i) {
+        const TopTools_ListOfShape& los = vertex2Edge.FindFromIndex(i);
+        if (los.Extent() != 2) {
+            const TopoDS_Vertex& vertex = TopoDS::Vertex(vertex2Edge.FindKey(i));
+            gp_Pnt pnt = BRep_Tool::Pnt(vertex);
+            points.push_back(Base::Vector3d(pnt.X(), pnt.Y(), pnt.Z()));
+        }
+    }
+
+    hidePoints();
+    if (!points.empty())
+        showPoints(points);
+}
+
 void SketcherValidation::on_findConstraint_clicked()
 {
     if (sketch->evaluateConstraints()) {
diff --git a/src/Mod/Sketcher/Gui/TaskSketcherValidation.h b/src/Mod/Sketcher/Gui/TaskSketcherValidation.h
index aad1f06a1..887e7b39e 100644
--- a/src/Mod/Sketcher/Gui/TaskSketcherValidation.h
+++ b/src/Mod/Sketcher/Gui/TaskSketcherValidation.h
@@ -49,6 +49,7 @@ protected:
 private Q_SLOTS:
     void on_findButton_clicked();
     void on_fixButton_clicked();
+    void on_highlightButton_clicked();
     void on_findConstraint_clicked();
     void on_fixConstraint_clicked();
     void on_findReversed_clicked();
diff --git a/src/Mod/Sketcher/Gui/TaskSketcherValidation.ui b/src/Mod/Sketcher/Gui/TaskSketcherValidation.ui
index a303939b1..3a4f01be8 100644
--- a/src/Mod/Sketcher/Gui/TaskSketcherValidation.ui
+++ b/src/Mod/Sketcher/Gui/TaskSketcherValidation.ui
@@ -57,6 +57,13 @@
         </property>
        </widget>
       </item>
+      <item row="1" column="1">
+       <widget class="QPushButton" name="fixButton">
+        <property name="text">
+         <string>Fix</string>
+        </property>
+       </widget>
+      </item>
       <item row="0" column="1">
        <widget class="QComboBox" name="comboBoxTolerance"/>
       </item>
@@ -67,10 +74,10 @@
         </property>
        </widget>
       </item>
-      <item row="1" column="1">
-       <widget class="QPushButton" name="fixButton">
+      <item row="2" column="0" colspan="2">
+       <widget class="QPushButton" name="highlightButton">
         <property name="text">
-         <string>Fix</string>
+         <string>Highlight open vertexes</string>
         </property>
        </widget>
       </item>