diff --git a/.gitattributes b/.gitattributes
index c8acd10815a..0a185ba6752 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -51,8 +51,10 @@ tests/roots/test-pycode/cp_1251_coded.py dos
 
 # Non UTF-8 encodings
 tests/roots/test-pycode/cp_1251_coded.py working-tree-encoding=windows-1251
-tests/roots/test-root/wrongenc.inc working-tree-encoding=latin-1
-tests/roots/test-warnings/wrongenc.inc working-tree-encoding=latin-1
+# the real encoding is iso-8859-1 (latin-1), but Git chokes on both names
+# cf. https://github.com/sphinx-doc/sphinx/pull/13811#issuecomment-3243213202
+tests/roots/test-root/wrongenc.inc working-tree-encoding=iso-8859
+tests/roots/test-warnings/wrongenc.inc working-tree-encoding=iso-8859
 
 # Generated files
 # https://github.com/github/linguist/blob/master/docs/overrides.md
diff --git a/sphinx/util/parsing.py b/sphinx/util/parsing.py
index 4c4a6477683..61c2e07fcf2 100644
--- a/sphinx/util/parsing.py
+++ b/sphinx/util/parsing.py
@@ -39,8 +39,7 @@ def nested_parse_to_nodes(
         Note that this option bypasses Docutils' usual checks on
         doctree structure, and misuse of this option can lead to
         an incoherent doctree. In Docutils, section nodes should
-        only be children of ``Structural`` nodes, which includes
-        ``document``, ``section``, and ``sidebar`` nodes.
+        only be children of ``document`` or ``section`` nodes.
     :param keep_title_context:
         If this is False (the default), then *content* is parsed as if it were
         an independent document, meaning that title decorations (e.g. underlines)
@@ -49,6 +48,9 @@ def nested_parse_to_nodes(
         a completely different context, such as docstrings.
         If this is True, then title underlines must match those in
         the surrounding document, otherwise the behaviour is undefined.
+        Warning: Up to Docutils 0.21, sections with an decoration style
+        matching a level that is higher than the current section level are
+        silently discarded! Since Docutils 0.22.1, an error is reported.
 
     .. versionadded:: 7.4
     """