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-rw-r--r--Doc/library/configparser.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/configparser.rst b/Doc/library/configparser.rst
index 185b4a1..04b52dc 100644
--- a/Doc/library/configparser.rst
+++ b/Doc/library/configparser.rst
@@ -721,6 +721,12 @@ be overridden by subclasses or by attribute assignment.
>>> list(custom['Section2'].keys())
['AnotherKey']
+ .. note::
+ The optionxform function transforms option names to a canonical form.
+ This should be an idempotent function: if the name is already in
+ canonical form, it should be returned unchanged.
+
+
.. attribute:: ConfigParser.SECTCRE
A compiled regular expression used to parse section headers. The default