diff --git a/src/pytest_doctest_docutils.py b/src/pytest_doctest_docutils.py
index aad04a3..a1681af 100644
--- a/src/pytest_doctest_docutils.py
+++ b/src/pytest_doctest_docutils.py
@@ -197,6 +197,10 @@ def _get_flag_lookup() -> t.Dict[str, int]:
 
 
 def get_optionflags(config: pytest.Config) -> int:
+    """Fetch optionflags from pytest configuration.
+
+    Extracted from pytest.doctest 8.0 (license: MIT).
+    """
     optionflags_str = str(config.getini("doctest_optionflags"))
     flag_lookup_table = _get_flag_lookup()
     flag_acc = 0