diff --git a/trunk/paradiseo-moeo/tutorial/Lesson2/Sch1.cpp b/trunk/paradiseo-moeo/tutorial/Lesson2/Sch1.cpp
index 055a2155e..718039921 100644
--- a/trunk/paradiseo-moeo/tutorial/Lesson2/Sch1.cpp
+++ b/trunk/paradiseo-moeo/tutorial/Lesson2/Sch1.cpp
@@ -25,6 +25,10 @@ public:
     {
         return true;
     }
+    static bool maximizing (int i)
+    {
+        return false;
+    }
     static unsigned int nObjectives ()
     {
         return 2;
diff --git a/trunk/paradiseo-moeo/tutorial/examples/flowshop/FlowShopObjectiveVectorTraits.cpp b/trunk/paradiseo-moeo/tutorial/examples/flowshop/FlowShopObjectiveVectorTraits.cpp
index b12d33aae..7296fdf0b 100644
--- a/trunk/paradiseo-moeo/tutorial/examples/flowshop/FlowShopObjectiveVectorTraits.cpp
+++ b/trunk/paradiseo-moeo/tutorial/examples/flowshop/FlowShopObjectiveVectorTraits.cpp
@@ -19,6 +19,11 @@ bool FlowShopObjectiveVectorTraits::minimizing (int _i)
     return true;
 }
 
+bool FlowShopObjectiveVectorTraits::maximizing (int _i)
+{
+    // minimizing both
+    return false;
+}
 
 unsigned int FlowShopObjectiveVectorTraits::nObjectives ()
 {
diff --git a/trunk/paradiseo-moeo/tutorial/examples/flowshop/FlowShopObjectiveVectorTraits.h b/trunk/paradiseo-moeo/tutorial/examples/flowshop/FlowShopObjectiveVectorTraits.h
index dac46aab0..994304e3f 100644
--- a/trunk/paradiseo-moeo/tutorial/examples/flowshop/FlowShopObjectiveVectorTraits.h
+++ b/trunk/paradiseo-moeo/tutorial/examples/flowshop/FlowShopObjectiveVectorTraits.h
@@ -29,6 +29,13 @@ public:
     static bool minimizing (int _i);
 
 
+    /**
+     * Returns true if the _ith objective have to be maximzed
+     * @param _i index of the objective
+     */
+    static bool maximizing (int _i);
+
+
     /**
      * Returns the number of objectives
      */