diff --git a/eo/tutorial/Lesson3/exercise3.1.cpp b/eo/tutorial/Lesson3/exercise3.1.cpp
index 9e401959c..2030ac878 100644
--- a/eo/tutorial/Lesson3/exercise3.1.cpp
+++ b/eo/tutorial/Lesson3/exercise3.1.cpp
@@ -296,9 +296,10 @@ void main_function(int argc, char **argv)
     monitor.add(SecondStat);
     monitor.add(fdcStat);
 
-    // test de eoPopStat and/or eoSortedPopStat
-    //    eoSortedPopStat<Indi> popStat("Dump of whole population");
-    eoPopStat<Indi> popStat("Dump of whole population");
+    // test de eoPopStat and/or eoSortedPopStat. 
+    // Dumps the whole pop every 10 gen.
+    //    eoSortedPopStat<Indi> popStat(10, "Dump of whole population");
+    eoPopStat<Indi> popStat(10, "Dump of whole population");
     checkpoint.add(popStat);
     monitor.add(popStat);