diff --git a/smp/src/topology/star.cpp b/smp/src/topology/star.cpp
index 1328d4937..08c911d73 100644
--- a/smp/src/topology/star.cpp
+++ b/smp/src/topology/star.cpp
@@ -32,19 +32,21 @@ Contact: paradiseo-help@lists.gforge.inria.fr
 
 void paradiseo::smp::Star::operator()(unsigned nbNode, std::vector<std::vector<bool>>& matrix) const
 {
-	matrix.clear();
+    matrix.clear();
 
-	matrix.resize(nbNode);
+    matrix.resize(nbNode);
 	for(auto& line : matrix)
 	    line.resize(nbNode);
+    
+    std::vector<bool> line (nbNode,false); 
 
-	std::vector<bool> line (nbNode,false);
+    line[_center]=true;
+    matrix.assign(nbNode,line);
 
-	line[0]=true;
-	matrix.assign(nbNode-1,line);
-	
-	line.clear();
-	line.assign(nbNode, false);
-	std::vector<std::vector<bool>>::iterator it = matrix.begin();
-	matrix.insert(it, line);
+    matrix[_center][_center]=false;
+}
+
+void paradiseo::smp::Star::setCenter(unsigned c)
+{
+    _center=c;
 }
diff --git a/smp/src/topology/star.h b/smp/src/topology/star.h
index 079573e70..9ecc4443d 100644
--- a/smp/src/topology/star.h
+++ b/smp/src/topology/star.h
@@ -39,7 +39,7 @@ namespace smp
 {
 
 /**
-*Star: Inherit from TopologyBuilder. Reprents a builder for a star topology : each node excepted the first has every other node for neighor. The first node doesn't have any neighbor.
+*Star: Inherit from TopologyBuilder. Represents a builder for a star topology : each node excepted the center has every other node for neighor. The center node doesn't have any neighbor. The center is the first node by default.
 */
 class Star : public TopologyBuilder
 {
@@ -48,6 +48,17 @@ public :
     *Fills the given matrix for a star topology with the specified number of nodes.
     */
 	void operator()(unsigned nbNode, std::vector<std::vector<bool>>& matrix) const;
+	
+	/**
+    *Setter for the variable _center
+    */
+    void setCenter(unsigned c);
+	
+private :
+    /**
+    *Index of the node which is the center. The change will not be done before next construction of the topology.
+    */
+    unsigned _center=0;
 };
 
 }