diff --git a/doc/examples/aggregation.rst b/doc/examples/aggregation.rst
index 82af59c4c..1b5c4202e 100644
--- a/doc/examples/aggregation.rst
+++ b/doc/examples/aggregation.rst
@@ -174,6 +174,7 @@ reduce function.
 Here we are doing a simple group and count of the occurrences of ``x`` values:
 
 .. doctest::
+
   >>> from bson.code import Code
   >>> reducer = Code("""
   ...                function(obj, prev){