diff --git a/netin/models/directed_model.py b/netin/models/directed_model.py
index 0ce10fb..456aa3c 100644
--- a/netin/models/directed_model.py
+++ b/netin/models/directed_model.py
@@ -143,7 +143,7 @@ def get_metadata(
         self._out_degrees.get_metadata(d[self.__class__.__name__])
         return d
 
-    def simulate(self) -> DiGraph:
+    def _simulate(self) -> DiGraph:
         tries = 0
         while self.graph.number_of_edges()\
                 < self._get_expected_number_of_edges():
diff --git a/netin/models/undirected_model.py b/netin/models/undirected_model.py
index e41db14..8c08c69 100644
--- a/netin/models/undirected_model.py
+++ b/netin/models/undirected_model.py
@@ -35,7 +35,7 @@ def _populate_initial_graph(self):
             for j in range(i):
                 self.graph.add_edge(i, j)
 
-    def simulate(self) -> Graph:
+    def _simulate(self) -> Graph:
         for source in range(
                 self.graph.number_of_nodes(), self.N):
             self.graph.add_node(source)