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-rw-r--r--Doc/library/exceptions.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Doc/library/exceptions.rst b/Doc/library/exceptions.rst
index 933667c..377d98a 100644
--- a/Doc/library/exceptions.rst
+++ b/Doc/library/exceptions.rst
@@ -185,7 +185,8 @@ The following exceptions are the exceptions that are usually raised.
A subclass of :exc:`ImportError` which is raised by :keyword:`import` when a
module could not be located. This includes ``from ... import`` statements as
the specific attribute being requested cannot be known a priori to be a module
- or some other type of object.
+ or some other type of object. It is also raised when ``None`` is found in
+ :data:`sys.modules`.
.. versionadded:: 3.4