diff --git a/docs/index.rst b/docs/index.rst
index 4f0dadb..2c2a7be 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -469,7 +469,9 @@ Currently the options available are:
 
 ``trio``
 ++++++++
-The `trio` backend ofers a lightweight async wrapper to ``subprocess``, takes advantage of the ``trio.open_process`` API.
+The ``trio`` backend ofers a lightweight async wrapper to ``subprocess``, takes advantage of the ``trio.`` `open_process`_ API.
+
+.. _open_process: https://trio.readthedocs.io/en/stable/reference-io.html#spawning-subprocesses
 
 
 ``multiprocessing``