diff --git a/examples/010_harmonic_example.py b/examples/010_harmonic_example.py
index 6d1b6c3b7..9918e1c18 100644
--- a/examples/010_harmonic_example.py
+++ b/examples/010_harmonic_example.py
@@ -131,6 +131,8 @@
     failure_evaluator.inputs.strains_container(strain_at_phase)
     failure_evaluator.inputs.mesh(composite_model.get_mesh())
 
+    # Note: the min/max layer indices are 1-based starting with
+    # Workbench 2024 R1 (DPF server 7.1)
     minmax_per_element = dpf.Operator("composite::minmax_per_element_operator")
     minmax_per_element.inputs.fields_container(failure_evaluator)
     minmax_per_element.inputs.mesh(composite_model.get_mesh())
diff --git a/src/ansys/dpf/composites/_composite_model_impl.py b/src/ansys/dpf/composites/_composite_model_impl.py
index 6a0876b76..dc6c0acb0 100644
--- a/src/ansys/dpf/composites/_composite_model_impl.py
+++ b/src/ansys/dpf/composites/_composite_model_impl.py
@@ -331,6 +331,8 @@ def evaluate_failure_criteria(
             # Ensure that sandwich criteria are evaluated
             evaluate_failure_criterion_per_scope_op.inputs.request_sandwich_results(True)
 
+            # Note: the min/max layer indices are 1-based starting with
+            # Workbench 2024 R1 (DPF server 7.1)
             minmax_el_op = dpf.Operator("composite::minmax_per_element_operator")
             minmax_el_op.inputs.fields_container(
                 evaluate_failure_criterion_per_scope_op.outputs.failure_container
diff --git a/src/ansys/dpf/composites/select_indices.py b/src/ansys/dpf/composites/select_indices.py
index 288da7fab..230d7519f 100644
--- a/src/ansys/dpf/composites/select_indices.py
+++ b/src/ansys/dpf/composites/select_indices.py
@@ -56,6 +56,11 @@ def get_selected_indices(
     Notes
     -----
     Returns an empty selection if any of the collections is empty.
+
+    The indices (nodes, layers, and spots) are 0-based. Pay attention to this
+    when using the "composite::minmax_per_element_operator" or
+    func:`~evaluate_failure_criteria` where the min/max layer indices
+    are 1-based starting with Workbench 2024 R1 (DPF server 7.1).
     """
     if layers is None:
         layer_indices: Collection[int] = range(element_info.n_layers)
diff --git a/tests/basic_workflow_test.py b/tests/basic_workflow_test.py
index c9b92922a..a92d67dd1 100644
--- a/tests/basic_workflow_test.py
+++ b/tests/basic_workflow_test.py
@@ -87,6 +87,8 @@ def test_basic_workflow(dpf_server, distributed_rst):
     failure_evaluator.inputs.stresses_container(stress_operator.outputs.fields_container)
     failure_evaluator.inputs.mesh(mesh_provider.outputs.mesh)
 
+    # Note: the min/max layer indices are 1-based starting with
+    # Workbench 2024 R1 (DPF server 7.1)
     minmax_per_element = dpf.Operator("composite::minmax_per_element_operator")
     minmax_per_element.inputs.fields_container(failure_evaluator.outputs.fields_container)
     minmax_per_element.inputs.mesh(mesh_provider.outputs.mesh)