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diff --git a/src/SketchPlugin/doc/perpendicularFeature.rst b/src/SketchPlugin/doc/perpendicularFeature.rst
index 3c4119688..a3e22a5a4 100644
--- a/src/SketchPlugin/doc/perpendicularFeature.rst
+++ b/src/SketchPlugin/doc/perpendicularFeature.rst
@@ -1,10 +1,47 @@
+.. _sketchPerpendicular:
+.. |Perpendicular.icon|    image:: images/Perpendicular.png
 
 Perpendicular constraint
 ========================
 
+Perpendicular constraint fixes two lines at 90 degrees to one another.
+For a line and a circle/arc the perpendicular constraint fixes the center of circle/arc to be on a line.
 
-.. image:: images/Perpendicular.png
-  :align: center
+To create a Perpendicular constraint in the active Sketch:
 
-.. centered::
-  Create a perpendicular constraint
+#. select in the Main Menu *Sketch - > Perpendicular* item  or
+#. click |Perpendicular.icon| **Perpendicular** button in Sketch toolbar:
+
+Property panel:
+
+.. figure:: images/Perpendicular_panel.png
+   :align: center
+
+Input fields:
+
+- **First object** is the first line, circle or arc selected in the view.
+- **Second object** is the second line, circle or arc selected in the view.
+
+After the objects are selected, a special sign will be added to each of them in the view.
+
+If one of selected objects is circular, then another has to be a straight line.
+
+**TUI Command**:
+
+.. py:function:: Sketch_1.setPerpendicular(Line1, Line2)
+
+    :param object: Line 1.
+    :param object: Line 2.
+    :return: Result object.
+
+Result
+""""""
+
+Created Perpendicular constraint appears in the view.
+
+.. figure:: images/Perpendicular_res.png
+   :align: center
+
+   Created perpendicular constraint
+
+**See Also** a sample TUI Script of :ref:`tui_create_perpendicular` operation.