diff --git a/docs/fundamentals/write-operations.txt b/docs/fundamentals/write-operations.txt
index 349372923..2e87677d1 100644
--- a/docs/fundamentals/write-operations.txt
+++ b/docs/fundamentals/write-operations.txt
@@ -9,7 +9,7 @@ Write Operations
    :values: tutorial
 
 .. meta::
-   :keywords: insert, insert one, code example, mass assignment, eloquent model
+   :keywords: insert, insert one, update, update one, upsert, code example, mass assignment, eloquent model
 
 .. contents:: On this page
    :local:
@@ -129,7 +129,6 @@ multiple instances of a ``Concert`` model as MongoDB documents. This bulk
 insert method reduces the number of calls your application needs to make
 to save the documents.
 
-
 When the ``insert()`` method succeeds, it returns the value ``1``.
 
 If it fails, it throws an exception.
@@ -156,7 +155,8 @@ Modify Documents
 
 In this section, you can learn how to modify documents in your MongoDB
 collection from your Laravel application. Use update operations to modify
-existing documents or to insert a document if none match the search criteria.
+existing documents or to insert a document if none match the search
+criteria.
 
 You can persist changes on an instance of an Eloquent model or use
 Eloquent's fluent syntax to chain an update operation on methods that
@@ -166,6 +166,7 @@ This section provides examples of the following update operations:
 
 - :ref:`Update a document <laravel-modify-documents-update-one>`
 - :ref:`Update multiple documents <laravel-modify-documents-update-multiple>`
+- :ref:`Update or insert in a single operation <laravel-modify-documents-upsert>`
 
 .. _laravel-modify-documents-update-one:
 
@@ -191,7 +192,7 @@ of the model and calling its ``save()`` method:
 When the ``save()`` method succeeds, the model instance on which you called the
 method contains the updated values.
 
-If the operation fails, {+odm-short+} assigns the model instance a null value.
+If the operation fails, {+odm-short+} assigns the model instance a ``null`` value.
 
 The following example shows how to update a document by chaining methods to
 retrieve and update the first matching document:
@@ -241,10 +242,72 @@ and update them:
 When the ``update()`` method succeeds, the operation returns the number of
 documents updated.
 
-If the retrieve part of the call does not match any documents in MongoDB,
-{+odm-short+} returns the following error:
+If the retrieve part of the call does not match any documents in the
+collection, {+odm-short+} returns the following error:
 
 .. code-block:: none
    :copyable: false
 
    Error: Call to a member function update() on null
+
+.. _laravel-modify-documents-upsert:
+
+Update or Insert in a Single Operation
+--------------------------------------
+
+An **upsert** operation lets you perform an update or insert in a single
+operation. This operation streamlines the task of updating a document or
+inserting one if it does not exist.
+
+To specify an upsert in an ``update()`` method, set the ``upsert`` option to
+``true`` as shown in the following code example:
+
+.. code-block:: php
+   :emphasize-lines: 4
+   :copyable: false
+
+   YourModel::where(/* match criteria */)
+      ->update(
+          [/* update data */],
+          ['upsert' => true]);
+
+When the ``update()`` method is chained to a query, it performs one of the
+following actions:
+
+- If the query matches documents, the ``update()`` method modifies the matching
+  documents.
+- If the query matches zero documents, the ``update()`` method inserts a
+  document that contains the update data and the equality match criteria data.
+
+Upsert Example
+~~~~~~~~~~~~~~
+
+This example shows how to pass the ``upsert`` option to the  ``update()``
+method to perform an update or insert in a single operation. Click the
+:guilabel:`VIEW OUTPUT` button to see the example document inserted when no
+matching documents exist:
+
+.. io-code-block::
+
+   .. input:: /includes/fundamentals/write-operations/WriteOperationsTest.php
+      :language: php
+      :dedent:
+      :emphasize-lines: 4
+      :start-after: begin model upsert
+      :end-before: end model upsert
+
+   .. output::
+      :language: json
+      :visible: false
+
+      {
+        "_id": "660c...",
+        "performer": "Jon Batiste",
+        "venue": "Radio City Music Hall",
+        "genres": [
+          "R&B",
+          "soul"
+        ],
+        "ticketsSold": 4000,
+        "updated_at": ...
+      }
diff --git a/docs/includes/fundamentals/write-operations/WriteOperationsTest.php b/docs/includes/fundamentals/write-operations/WriteOperationsTest.php
index a868c1fe8..5f759ae6b 100644
--- a/docs/includes/fundamentals/write-operations/WriteOperationsTest.php
+++ b/docs/includes/fundamentals/write-operations/WriteOperationsTest.php
@@ -214,4 +214,28 @@ public function testModelUpdateMultiple(): void
             $this->assertEquals(0, $result->ticketsSold);
         }
     }
+
+    /**
+     * @runInSeparateProcess
+     * @preserveGlobalState disabled
+     */
+    public function testModelUpsert(): void
+    {
+        require_once __DIR__ . '/Concert.php';
+        Concert::truncate();
+
+        // begin model upsert
+        Concert::where(['performer' => 'Jon Batiste', 'venue' => 'Radio City Music Hall'])
+            ->update(
+                ['genres' => ['R&B', 'soul'], 'ticketsSold' => 4000],
+                ['upsert' => true],
+            );
+        // end model upsert
+
+        $result = Concert::first();
+
+        $this->assertInstanceOf(Concert::class, $result);
+        $this->assertEquals('Jon Batiste', $result->performer);
+        $this->assertEquals(4000, $result->ticketsSold);
+    }
 }