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Clarify what operations the default "Undefined" supports #1818

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Clarify what operations the default "Undefined" supports #1818

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5 changes: 3 additions & 2 deletions src/jinja2/runtime.py
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Original file line number Diff line number Diff line change
Expand Up @@ -787,8 +787,9 @@ def __repr__(self) -> str:


class Undefined:
"""The default undefined type. This undefined type can be printed and
iterated over, but every other access will raise an :exc:`UndefinedError`:
"""The default undefined type. This undefined type can be printed,
iterated over, and used in boolean expressions, however any other
operation will raise an :exc:`UndefinedError`:

>>> foo = Undefined(name='foo')
>>> str(foo)
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