diff --git a/doc/salome/gui/GEOM/arc.htm b/doc/salome/gui/GEOM/arc.htm
index ab5373695..50b685ae8 100755
--- a/doc/salome/gui/GEOM/arc.htm
+++ b/doc/salome/gui/GEOM/arc.htm
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@@ -91,39 +130,128 @@ if (window.writeIntopicBar)
 
 <p class="whs2">&nbsp;</p>
 
-<p class="whs2"><b style="font-weight: bold;"><span style="font-weight: normal;">You 
- can define an</span> Arc <span style="font-weight: normal;">by</span> 
- <span style="font-weight: normal;">three</span><span style="font-weight: bold;"><B> 
- Points </B></span><span style="font-weight: normal;">that lie on it, where 
- </span></b>Point1 is the starting point, Point2 is a middle point of the 
- arc and Point3 is the ending point of the arc.</p>
+<p class="whs3"><b style="font-weight: bold;"><span 
+ style="font-weight: normal;">There are 2 algorithms to create an </span><span 
+ style="font-weight: bold;"><B>Arc</B></span><span style="font-weight: normal;"> 
+ in the 3D space. </span></b></p>
 
-<p class="whs2"><b><span style="font-weight: normal;">The</span> 
- Result <span style="font-weight: normal;">of the operation will be a</span></b><b> 
- <span style="font-weight: normal;">GEOM_Object (edge).</span></b></p>
+<p class="whs2"><b><span style="font-weight: normal;">The Result 
+ of each operation will be a</span></b><b> <span style="font-weight: normal;">GEOM_Object 
+ (edge).</span></b></p>
 
 <p class="whs2">&nbsp;</p>
 
-<p class="whs2"><b style="font-weight: bold;">TUI Command:</b> 
- <span style="font-style: italic;"><I>geompy.MakeArc(Point1, Point2, Point3)</I></span></p>
+<p class="whs2"><b style="font-weight: bold;"><span style="font-weight: normal;">Firstly, 
+ you can define an</span> Arc <span style="font-weight: normal;">by</span> 
+ <span style="font-weight: normal;">three</span><span style="font-weight: bold;"><B> 
+ Points </B></span><span style="font-weight: normal;">that lie on it, where 
+ </span></b>Point1 
+ is the starting point, Point2 
+ is a middle point of the arc and Point3 
+ is the ending point of the arc.</p>
+
+<p class="whs2"><b style="font-weight: bold;">TUI 
+ Command:</b> <span style="font-style: italic;"><I>geompy.MakeArc(Point1, 
+ Point2, Point3)</I></span></p>
 
 <p class="whs2"><b style="font-weight: bold;">Arguments:</b> 
  Name + 3 vertices.</p>
 
 <p class="whs2">&nbsp;</p>
 
-<p class="whs3"><img src="pics/arc.png" x-maintain-ratio="TRUE" width="312px" height="359px" border="0" class="img_whs4"></p>
+<p class="whs4"><img src="pics/arc.png" x-maintain-ratio="TRUE" width="312px" height="359px" border="0" class="img_whs5"></p>
 
-<p class="whs5">&nbsp;</p>
+<p class="whs6">&nbsp;</p>
 
-<p class="whs6"><b style="font-weight: bold;">Example:</b></p>
+<p class="whs7"><b style="font-weight: normal;">Secondly, 
+ you can define an <span style="font-weight: bold;"><B>Arc</B></span> by </b><span 
+ style="font-weight: bold;"><B>Center, Start</B></span> and <span style="font-weight: bold;"><B>End</B></span> 
+ points. The arc is built from the <span style="font-weight: bold;"><B>Start</B></span> 
+ point to the <span style="font-weight: bold;"><B>End</B></span> point. The radius 
+ of the arc is defined by the distance between the <span style="font-weight: bold;"><B>Center</B></span> 
+ point and the <span style="font-weight: bold;"><B>Start</B></span> point. The 
+ <span style="font-weight: bold;"><B>End</B></span> point defines the angle of 
+ the arc. If the distance between the <span style="font-weight: bold;"><B>Center</B></span> 
+ point and the <span style="font-weight: bold;"><B>End</B></span> point is not 
+ equal to the radius, the arc will be built anyway.</p>
 
-<p class="whs5">&nbsp;</p>
+<p class="whs7"><span style="font-weight: bold;"><B>Reverse</B></span> 
+ radio button allows to change the direction of the arc.</p>
 
-<p class="whs7"><img src="pics/arcsn.png" x-maintain-ratio="TRUE" width="330px" height="283px" border="0" class="img_whs8"></p>
+<p class="whs7"><b style="font-weight: bold;">TUI Command:</b> 
+ <span style="font-style: italic;"><I>geompy.MakeArcCenter(Center Point, Start 
+ Point, End Point, boolean Sense)</I></span></p>
+
+<p class="whs7"><span style="font-style: italic;"><I><b 
+ style="font-weight: bold;">A</I></span>rguments:</b> Name + 3 vertices + Boolean.</p>
 
 <p class="whs7">&nbsp;</p>
 
+<p class="whs4"><img src="pics/arc2.png" x-maintain-ratio="TRUE" width="400px" height="385px" border="0" class="img_whs8"></p>
+
+<p class="whs9">&nbsp;</p>
+
+<p class="whs9"><b style="font-weight: bold;">Example:</b></p>
+
+<p class="whs9">&nbsp;</p>
+
+<table x-use-null-cells cellspacing="0" width="86.687%" class="whs10">
+<col class="whs11">
+<col class="whs12">
+<col class="whs13">
+<col class="whs13">
+
+<tr valign="top" class="whs14">
+<td width="38.452%" class="whs15">
+<p>Arc by three points lying on it.</td>
+<td width="28.09%" class="whs16">
+<p>Arc by Start, End and Center.</td>
+<td colspan="1" rowspan="1" width="16.729%" class="whs17">
+<p>&nbsp;</td>
+<td width="16.729%" class="whs17">
+<p>Reversed arc.</td></tr>
+
+<tr valign="top" class="whs14">
+<td width="38.452%" class="whs18">
+<p class="whs6"><img src="pics/arcsn.png" x-maintain-ratio="TRUE" width="316px" height="270px" border="0" class="img_whs19"></td>
+<td width="28.09%" class="whs20">
+<p><img src="pics/arcsn1.png" x-maintain-ratio="TRUE" width="212px" height="270px" border="0" class="img_whs21"></td>
+<td colspan="1" rowspan="1" width="16.729%" class="whs22">
+<table x-use-null-cells cellspacing="0" width="100%" class="whs23">
+<col class="whs24">
+
+<tr valign="top" class="whs25">
+<td width="100%" class="whs26">
+<p class="whs27">Start Point</td></tr>
+
+<tr valign="top" class="whs28">
+<td width="100%" class="whs29">
+<p>&nbsp;</td></tr>
+
+<tr valign="top" class="whs30">
+<td width="100%" class="whs29">
+<p>&nbsp;</td></tr>
+
+<tr valign="top" class="whs25">
+<td width="100%" class="whs29">
+<p>Center Point</td></tr>
+
+<tr valign="top" class="whs31">
+<td width="100%" class="whs29">
+<p>&nbsp;</td></tr>
+
+<tr valign="top" class="whs25">
+<td width="100%" class="whs32">
+<p>End Point</td></tr>
+</table>
+<p class="whs33">&nbsp;</p>
+<p>&nbsp;</td>
+<td width="16.729%" class="whs22">
+<p><img src="pics/arcsn2.png" x-maintain-ratio="TRUE" width="318px" height="269px" border="0" class="img_whs34"></td></tr>
+</table>
+
+<p class="whs35">&nbsp;</p>
+
 <p class="whs2">Our TUI Scripts provide you with useful examples 
  of creation of <a href="basic_geometrical_objects.htm">Basic Geometric 
  Objects</a>. </p>