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diff --git a/src/SketchPlugin/doc/tangentFeature.rst b/src/SketchPlugin/doc/tangentFeature.rst
index 2ddc42082..b4ca71dd5 100644
--- a/src/SketchPlugin/doc/tangentFeature.rst
+++ b/src/SketchPlugin/doc/tangentFeature.rst
@@ -1,3 +1,46 @@
+.. |tangent.icon|    image:: images/tangent.png
 
 Tangent constraint
 ==================
+
+Tangent constraint fixes a circle (or an arc) and a line so that a line is tangent to a circle (or an arc).
+
+To create a Tangent in the active Sketch:
+
+#. select in the Main Menu *Sketch - > Tangent* item  or
+#. click |tangent.icon| **Tangent** button in Sketch toolbar:
+
+Property panel:
+
+.. image:: images/Tangent_panel.png
+   :align: center
+
+Input fields:
+
+- **First object** is a line, a circle or an arc selected in the view.
+- **Second object** is a line, a circle or an arc selected in the view.
+
+Note that one of two objects should be a line.
+
+After the objects are selected, a special sign will be added close to the tangency point in the view.
+
+**TUI Command**:
+
+.. py:function:: Sketch_1.setTangent(Line, CircleOrArc)
+
+    :param object: A line.
+    :param object: A circle or an arc.
+    :return: Result object.
+
+Result
+""""""
+
+Created Tangent constraint appears in the view.
+
+.. image:: images/Tangent_res.png
+	   :align: center
+
+.. centered::
+   Created tangent constraint
+
+**See Also** a sample TUI Script of :ref:`tui_create_tangent` operation.