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improvements to $set reference #2081

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improvements to $set reference #2081

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13 changes: 9 additions & 4 deletions source/reference/operator/update/set.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ Definition

.. update:: $set

The :update:`$set` operator replaces the value of a field to the
The :update:`$set` operator replaces the value of a field with the
specified value.

The :update:`$set` operator expression has the following form:
Expand All @@ -23,11 +23,16 @@ Definition
Behavior
--------

If the field does not exist, :update:`$set` will add the field with the
specified value. If you specify a dotted path for a non-existent field,
:update:`$set` will also create the embedded documents *as needed* to
If the field does not exist, :update:`$set` will add a new field with the
specified value, provided that the new field does not violate a type
constraint.
If you specify a dotted path for a non-existent field,
:update:`$set` will create the embedded documents *as needed* to
fulfill the dotted path to the field.

If you specify multiple field-value pairs, :update:`$set` will update
or create each field.

Examples
--------

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