diff --git a/library/cadbiom/models/guard_transitions/chart_model.py b/library/cadbiom/models/guard_transitions/chart_model.py
index 532802bb9db6883823a129bcae76ad394db0e03f..7b3c301916f602291707555e522021caeb88bb05 100644
--- a/library/cadbiom/models/guard_transitions/chart_model.py
+++ b/library/cadbiom/models/guard_transitions/chart_model.py
@@ -852,6 +852,7 @@ class CSimpleNode(CNode):
         return True
 
     def set_name(self, name):
+        """Rename the current node; update simple_node_dict attr of the model"""
         try:
             del self.model.simple_node_dict[self.name]
         except: