Add missing link in docs

docs/source/user_guide/workflows.rst

@@ -847,4 +847,10 @@ The ``aiida_kkr.workflows.kkr_STM_wc`` workflow allows to simulate the local DOS
 
 See API documentation for inputs/outputs: https://aiida-kkr.readthedocs.io/en/latest/module_guide/workflows.html#module-aiida_kkr.workflows.kkr_STM
 
-See tests for a usage example: https://github.com/JuDFTteam/aiida-kkr/blob/develop/tests/workflows/test_stm.py
+Example Usage
+-------------
+
+See:
+* the STM tutorial notbook: https://github.com/JuDFTteam/aiida-kkr/blob/develop/examples/AiiDA-KKR_STM_Tutorial.ipynb
+* the CI tests: https://github.com/JuDFTteam/aiida-kkr/blob/develop/tests/workflows/test_stm.py
+for a usage examples.