diff --git a/pylint/checkers/refactoring/len_checker.py b/pylint/checkers/refactoring/len_checker.py
index eafe44430b4..68d677abb6f 100644
--- a/pylint/checkers/refactoring/len_checker.py
+++ b/pylint/checkers/refactoring/len_checker.py
@@ -120,6 +120,7 @@ def visit_unaryop(self, node):
 
     @staticmethod
     def base_classes_of_node(instance: astroid.nodes.ClassDef) -> List[astroid.Name]:
+        """Return all the classes names that a ClassDef inherit from including 'object'."""
         mother_classes = [instance.name]
         base_classes = instance.bases
         while base_classes and "object" not in mother_classes: