diff --git a/source/core/query-optimization.txt b/source/core/query-optimization.txt
index 528b0d49829..fd0781d7280 100644
--- a/source/core/query-optimization.txt
+++ b/source/core/query-optimization.txt
@@ -108,7 +108,7 @@ documents.
    .. code-block:: javascript
 
       db.inventory.find( { type: "food", item:/^c/ },
-                         { item: 1, _id: 0 } )
+                         { item: 1 } )
 
    However, the index will **not** cover the following query, which
    returns the ``item`` field **and** the ``_id`` field:
@@ -116,7 +116,7 @@ documents.
    .. code-block:: javascript
 
       db.inventory.find( { type: "food", item:/^c/ },
-                         { item: 1 } )
+                         { item: 1, _id: 0 } )
 
 See :ref:`indexes-covered-queries` for more information on the
 behavior and use of covered queries.