diff --git a/docs/advanced.rst b/docs/advanced.rst
index 79e98da8..194f72ca 100644
--- a/docs/advanced.rst
+++ b/docs/advanced.rst
@@ -289,7 +289,7 @@ will detect it.
                                       the current project.
 
 
-Also note that `pip itself supports environment variables <https://pip.pypa.io/en/stable/user_guide/#environment-variables>`, if you need additional customization.
+Also note that `pip itself supports environment variables <https://pip.pypa.io/en/stable/user_guide/#environment-variables>`_, if you need additional customization.
 
 ☤ Custom Virtual Environment Location
 -------------------------------------