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2 changes: 1 addition & 1 deletion source/core/document.txt
Original file line number Diff line number Diff line change
Expand Up @@ -249,7 +249,7 @@ The ``_id`` field has the following behavior and constraints:
server receives a document that does not have the ``_id`` field
first, then the server will move the field to the beginning.

_ If the ``_id`` contains subfields, the subfield names cannot begin
- If the ``_id`` contains subfields, the subfield names cannot begin
with a (``$``) symbol.

- The ``_id`` field may contain values of any :doc:`BSON data type
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