diff --git a/source/reference/operator/update/inc.txt b/source/reference/operator/update/inc.txt
index b8390ceb4d0..7651f40083d 100644
--- a/source/reference/operator/update/inc.txt
+++ b/source/reference/operator/update/inc.txt
@@ -4,52 +4,46 @@ $inc
 
 .. default-domain:: mongodb
 
+Definition
+----------
+
 .. update:: $inc
 
-   The :update:`$inc` operator increments a value of a field by a
-   specified amount. If the field does not exist, :update:`$inc` adds
-   the field and sets the field to the specified amount.
-   :update:`$inc` accepts positive and negative incremental
-   amounts. Consider the following syntax:
+   The :update:`$inc` operator increments a field by a specified value and
+   has the following form:
 
    .. code-block:: javascript
 
-      { $inc: { <field1>: <amount1>, ... } }
+      { $inc: { <field1>: <amount1>, <field2>: <amount2>, ... } }
 
-   The following example increments the value of ``quantity`` by ``5``
-   for the *first* matching document in the ``products`` collection
-   where ``sku`` equals ``abc123``:
+Behavior
+--------
 
-   .. code-block:: javascript
+The :update:`$inc` operator accepts positive and negative values.
 
-      db.products.update( { sku: "abc123" },
-                          { $inc: { quantity: 5 } } )
+If the field does not exist, :update:`$inc` adds the field to a document
+and sets the field to the specified value.
 
-   To update all matching documents in the collection, specify
-   ``multi:true`` option in the :method:`~db.collection.update()`
-   method. For example:
+Use of the :update:`$inc` operator on a field with a null value will
+generate an error.
 
-   .. code-block:: javascript
+Examples
+--------
 
-      db.records.update( { age: 20 }, { $inc: { age: 1 } }, { multi: true } );
+The following :method:`~db.collection.update()` operation uses the
+:update:`$inc` operator to decrease the ``quantity`` field and increase
+the ``sales`` field for the *first* matching document in the ``products``
+collection where ``sku`` equals ``abc123``.
 
-   The :method:`~db.collection.update()` operation increments the value
-   of the ``age`` field by ``1`` for all documents in the ``records``
-   collection that have an ``age`` field equal to ``20``.
+.. code-block:: javascript
 
-   The :update:`$inc` operator can operate on multiple fields in a
-   document. The following :method:`~db.collection.update()` operation
-   uses the :update:`$inc` operator to modify both the ``quantity``
-   field and the ``sales`` field for the *first* matching document in
-   the ``products`` collection where ``sku`` equals ``abc123``:
+   db.products.update( { sku: "abc123" },
+                       { $inc: { quantity: -2, sales: 2 } } )
 
-   .. code-block:: javascript
+The :update:`$inc` operator expression specifies ``-2`` for the
+``quantity`` field to *decrease* the value of the ``quantity`` field (i.e.
+increment by ``-2``) and specifies ``2`` for the ``sales`` field to
+increase the value of the ``sales`` field by ``2``.
 
-      db.products.update( { sku: "abc123" },
-                          { $inc: { quantity: -2, sales: 2 } } )
+See the :method:`~db.collection.update()` method for more information.
 
-   In the above example, the :update:`$inc` operator expression
-   specifies ``-2`` for the ``quantity`` field to *decrease* the value
-   of the ``quantity`` field (i.e. increment by ``-2``) and specifies
-   ``2`` for the ``sales`` field to increase the value of the ``sales``
-   field by ``2``.