diff --git a/src/icalendar/tests/test_with_doctest.py b/src/icalendar/tests/test_with_doctest.py
index 7710a003..5912d6f7 100644
--- a/src/icalendar/tests/test_with_doctest.py
+++ b/src/icalendar/tests/test_with_doctest.py
@@ -75,7 +75,8 @@ def test_documentation_file(document, zoneinfo_only, env_for_doctest, tzp):
     functions are also replaced to work.
     """
     try:
-        test_result = doctest.testfile(document, module_relative=False, globs=env_for_doctest, raise_on_error=False)
+        # set raise_on_error to False if you wand to see the error for debug
+        test_result = doctest.testfile(document, module_relative=False, globs=env_for_doctest, raise_on_error=True)
     except doctest.UnexpectedException as e:
         ty, err, tb = e.exc_info
         if issubclass(ty, ModuleNotFoundError) and err.name == "pytz":