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Update index-single.txt #1559

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8 changes: 4 additions & 4 deletions source/core/index-single.txt
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Expand Up @@ -51,10 +51,10 @@ Cases
``_id`` Field Index
~~~~~~~~~~~~~~~~~~~

For all collections, MongoDB creates the default ``_id`` index, which
is a :ref:`unique index <index-type-unique>` on the ``_id`` field.
MongoDB creates this index by default on all collections. You cannot
delete the index on ``_id``.
MongoDB creates the ``_id`` index, which is an ascending :ref:`unique
index <index-type-unique>` on the ``_id`` field for all collections when
the collection is created. The index on the ``_id`` field cannot be
deleted.

You can think
of the ``_id`` field as the :term:`primary key` for the collection.
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