diff --git a/doc/en/how-to/doctest.rst b/doc/en/how-to/doctest.rst
index 2cec984f9..c2a6cc8e9 100644
--- a/doc/en/how-to/doctest.rst
+++ b/doc/en/how-to/doctest.rst
@@ -227,6 +227,7 @@ place the objects you want to appear in the doctest namespace:
     import pytest
     import numpy
 
+
     @pytest.fixture(autouse=True)
     def add_np(doctest_namespace):
         doctest_namespace["np"] = numpy