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-rw-r--r--docs/ref/validators.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/docs/ref/validators.txt b/docs/ref/validators.txt
index 8148dd6f7a..0136fb45a3 100644
--- a/docs/ref/validators.txt
+++ b/docs/ref/validators.txt
@@ -286,6 +286,7 @@ to, or in lieu of custom ``field.clean()`` methods.
Raises a :exc:`~django.core.exceptions.ValidationError` with a code of
``'invalid_extension'`` if the extension of ``value.name`` (``value`` is
a :class:`~django.core.files.File`) isn't found in ``allowed_extensions``.
+ The extension is compared case-insensitively with ``allowed_extensions``.
.. warning::