diff --git a/src/_pytest/nodes.py b/src/_pytest/nodes.py
index c920800df1..d5ff3a87ed 100644
--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -214,7 +214,8 @@ def __init__(
         # Deprecated alias. Was never public. Can be removed in a few releases.
         self._store = self.stash
 
-        #: A list of exceptions that happened during teardown
+        #: A list of exceptions that happened during teardown. Intended for
+        #: post-teardown inspection, not required internally.
         self.teardown_exceptions: list[BaseException] = []
 
     @classmethod
diff --git a/testing/acceptance_test.py b/testing/acceptance_test.py
index 9f09a6be93..ad829889c5 100644
--- a/testing/acceptance_test.py
+++ b/testing/acceptance_test.py
@@ -1608,4 +1608,6 @@ def test_func(mylist):
     result = pytester.runpytest()
     assert result.ret == ExitCode.TESTS_FAILED
     assert "teardown_exceptions: `[AssertionError(111)]`" in result.stderr.str()
+    # Related to the #9909 - first the test passes, then the teardown fails, what
+    # results in a double-reporting.
     result.assert_outcomes(passed=1, errors=1)