--- /dev/null
+
+/**
+ @file
+ \brief Help for the undo redo
+*/
+
+/**
+ \page undo_redo Undo/Redo actions
+
+ <a href="index.html"><b>Back to Main page.</b></a>
+
+ The HYDROGUI module supports two levels of <b>Undo/Redo</b> functionality:<ul>
+ <li><b>Global</b> undo/redo<br>
+ Global undo reverts last operation, redo performs latest undone operation (if there is any);</li>
+ <li><b>Local</b> undo/redo - is available only for \ref create_profile "profiles" and \ref polyline "polylines" creation/edition</li>.
+ </ul>
+
+ <b>Global Undo</b> operation can be executed via:<ol>
+ <li> The main menu <b>Edit => Undo</b>;</li>
+ <li><b>Undo</b> toolbar button; </li>
+
+ \image html undo_toolbar_button.png "Undo toolbar button"
+
+ <li><b>CTRL + Z</b> buttons combination; </li>
+ <li>Selection of operations to be undone with help of <b>Undo</b> combo-box</li>
+
+ \image html undo_combo_box.png "Undo combo-box"
+ </ol>
+
+ <b>Global Redo</b> operation can be executed via:<ol>
+ <li> The main menu <b>Edit => Redo</b>;</li>
+ <li><b>Redo</b> toolbar button; </li>
+
+ \image html redo_toolbar_button.png "Redo toolbar button"
+
+ <li><b>CTRL + Y</b> buttons combination; </li>
+ <li>Selection of operations to be redone with help of <b>Redo</b> combo-box</li>
+ </ol>
+
+ \image html redo_combo_box.png "Redo combo-box"
+
+ <a href="index.html"><b>Back to Main page.</b></a>
+
+*/
