diff --git a/app/notify_client/service_api_client.py b/app/notify_client/service_api_client.py
index ac068dd8f..a3dfbcc40 100644
--- a/app/notify_client/service_api_client.py
+++ b/app/notify_client/service_api_client.py
@@ -109,12 +109,12 @@ class ServiceAPIClient(NotifyAdminAPIClient):
             'go_live_user',
             'go_live_at',
             'rate_limit',
+            'notes',
         }
         if disallowed_attributes:
             raise TypeError('Not allowed to update service attributes: {}'.format(
                 ", ".join(disallowed_attributes)
             ))
-
         endpoint = "/service/{0}".format(service_id)
         return self.post(endpoint, data)
 
diff --git a/tests/app/main/views/test_service_settings.py b/tests/app/main/views/test_service_settings.py
index 1bf7779ed..932049a96 100644
--- a/tests/app/main/views/test_service_settings.py
+++ b/tests/app/main/views/test_service_settings.py
@@ -5260,3 +5260,22 @@ def test_view_edit_service_notes(
     page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
     assert page.select_one('h1').text == "Edit service notes"
     assert page.find('label', class_="form-label").text.strip() == "Notes"
+
+
+def test_update_service_notes(
+        platform_admin_client,
+        service_one,
+        mock_update_service
+):
+    response = platform_admin_client.post(
+        url_for(
+            'main.edit_service_notes',
+            service_id=SERVICE_ONE_ID,
+        ),
+        data={'notes': "Very fluffy"}
+    )
+    assert response.status_code == 302
+    settings_url = url_for(
+        'main.service_settings', service_id=SERVICE_ONE_ID, _external=True)
+    assert settings_url == response.location
+    mock_update_service.assert_called_with(SERVICE_ONE_ID, notes="Very fluffy")