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Add clarification when no results exist before the $count stage #6192

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Add clarification when no results exist before the $count stage #6192

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2 changes: 2 additions & 0 deletions source/reference/operator/aggregation/count.txt
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Expand Up @@ -60,6 +60,8 @@ The :pipeline:`$count` stage is equivalent to the following
where ``myCount`` would be the output field that contains the count.
You can specify another name for the output field.

If the previous stage contains 0 documents, this stage will **NOT** return a single document with `{myCount: 0}`; It will return the result of 0 documents, and this stage will not be executed.

.. seealso::

:method:`db.collection.countDocuments()` which wraps the
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