Issue 1781. Now ConfigParser.add_section does not let you add a
DEFAULT section any more, because it duplicated sections with
the rest of the machinery. Thanks Tim Lesher and Manuel Kaufmann.
diff --git a/Doc/library/configparser.rst b/Doc/library/configparser.rst
index ec3b022..96c001f 100644
--- a/Doc/library/configparser.rst
+++ b/Doc/library/configparser.rst
@@ -187,8 +187,9 @@
.. method:: RawConfigParser.add_section(section)
Add a section named *section* to the instance. If a section by the given name
- already exists, :exc:`DuplicateSectionError` is raised.
-
+ already exists, :exc:`DuplicateSectionError` is raised. If the name
+ ``DEFAULT`` (or any of it's case-insensitive variants) is passed,
+ :exc:`ValueError` is raised.
.. method:: RawConfigParser.has_section(section)