diff --git a/source/reference/aggregation/group.txt b/source/reference/aggregation/group.txt
index fde2eaacf23..004737d934b 100644
--- a/source/reference/aggregation/group.txt
+++ b/source/reference/aggregation/group.txt
@@ -20,7 +20,7 @@ $group (aggregation)
 
    .. code-block:: javascript
 
-      { _id : { author: 1, pageViews: 1, posted: 1 } }
+      { _id : { author: $author$, pageViews: $pageViews$, posted: $posted$ } }
 
    With the exception of the ``_id`` field, :pipeline:`$group` cannot
    output nested documents.