diff --git a/docs/source/release-process.rst b/docs/source/release-process.rst
index a33e83c0..2fee40c4 100644
--- a/docs/source/release-process.rst
+++ b/docs/source/release-process.rst
@@ -154,7 +154,7 @@ create a new virtualenv, ``cd`` into a clean directory and then run:
 
 .. code-block:: bash
 
-   $ pip install -i https://testpypi.python.org/pypi zipline
+   $ pip install --extra-index-url https://testpypi.python.org/pypi zipline
    $ python -c 'import zipline;print(zipline.__version__)'