diff --git a/docs/source/advanced/domain_name_resolution/index.rst b/docs/source/advanced/domain_name_resolution/index.rst
index 7b98533b8..13e5c4955 100644
--- a/docs/source/advanced/domain_name_resolution/index.rst
+++ b/docs/source/advanced/domain_name_resolution/index.rst
@@ -4,4 +4,4 @@ Domain Name Resolution
 .. toctree::
    :maxdepth: 2
 
-   domain_name_resolution.rst 
+   domain_name_resolution.rst