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2 changes: 1 addition & 1 deletion source/core/indexes.txt
Original file line number Diff line number Diff line change
Expand Up @@ -104,7 +104,7 @@ You cannot delete the index on ``_id``.

The ``_id`` field is the :term:`primary key` for the collection, and
every document *must* have a unique ``_id`` field. You may store any
unique value in the ``_id`` field. The default value of ``_id`` is
unique value in the ``_id`` field. The default value of ``_id`` is an
:term:`ObjectID` on every insert() <db.collection.insert()` operation. An :term:`ObjectId`
is a 12-byte unique identifiers suitable for use as the value of an
``_id`` field.
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