diff --git a/source/reference/command/update.txt b/source/reference/command/update.txt
index f2d843f90d7..5d49f27275f 100644
--- a/source/reference/command/update.txt
+++ b/source/reference/command/update.txt
@@ -62,7 +62,7 @@ If the ``<update>`` document contains all :ref:`update operator
 
    {
      $set: { status: "D" },
-     quantity: { $inc: 2 }
+     $inc: { quantity: 2 }
    }
 
 Then, the :dbcommand:`update` command updates only the corresponding