-<li>angle of rotation,</li>
-<li>number of steps,</li>
+<li>angle of rotation and number of steps,</li>
+<ul> <li> Angle by Step - the elements are extruded by the specified angle at each step (i.e. for Angle=30 and Number of Steps=2, the elements will be extruded
+ by 30 degrees twice for a total of 30*2=60)</li>
+
+\image html revolutionsn2.png
+
+<li> Total Angle - the elements are extruded by the specified angle only once and the number of steps defines the number of iterations
+(i.e.for Angle=30 and Number of Steps=2, the elements will be extruded by 30/2=15 degrees twice for a total of 30). </li>
+
+\image html revolutionsn1.png
+
+</ul>