diff --git a/pygenalgo/engines/auxiliary.py b/pygenalgo/engines/auxiliary.py
index ae04c70..3bba68f 100644
--- a/pygenalgo/engines/auxiliary.py
+++ b/pygenalgo/engines/auxiliary.py
@@ -213,6 +213,6 @@ def __contains__(self, item: Chromosome) -> bool:
         :return: true if the 'item' belongs in the population.
         """
         return item in self.population
-    # _end_if_
+    # _end_def_
 
 # _end_class_