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diff --git a/src/FeaturesPlugin/doc/unionFeature.rst b/src/FeaturesPlugin/doc/unionFeature.rst
index 6e3d9a2b0..9a3cef4cd 100644
--- a/src/FeaturesPlugin/doc/unionFeature.rst
+++ b/src/FeaturesPlugin/doc/unionFeature.rst
@@ -2,9 +2,46 @@
 Union
 =====
 
+Union feature implements a Boolean operation for creation of a union of selected objects.
+
+To create a Union in the active part:
+
+#. select in the Main Menu *Features - > Union* item  or
+#. click **Union** button in the toolbar
+
+.. image:: images/union_btn.png
+   :align: center
+
+.. centered::
+   **Union**  button 
+
+The following property panel will be opened:
 
 .. image:: images/Union.png
   :align: center
 
 .. centered::
-  Union definition
+   **Union operation**
+
+Here it is necessary to select some objects. Only faces with shared edges or solids with shared faces are allowed for selection.
+
+**Apply** button creates a union shape.
+  
+**Cancel** button cancels the operation.
+
+**TUI Command**:  *model.addUnion(Part_doc, objects)*
+
+**Arguments**:   Part + list of objects.
+
+Result
+""""""
+
+The Result of the operation will be a shape which is a union of selected objects:
+
+.. image:: images/CreatedUnion.png
+	   :align: center
+
+.. centered::
+   **Union created**
+
+**See Also** a sample TUI Script of :ref:`tui_create_union` operation.