diff --git a/doc/source/devref/development.environment.rst b/doc/source/devref/development.environment.rst
index 7602b02f6fc2..37268c66ff23 100644
--- a/doc/source/devref/development.environment.rst
+++ b/doc/source/devref/development.environment.rst
@@ -124,9 +124,10 @@ You can manually install the virtual environment instead of having
   python tools/install_venv.py
 
 This will install all of the Python packages listed in the
-``requirements.txt`` file into your virtualenv. There will also be some
-additional packages (pip, setuptools, greenlet) that are installed
-by the ``tools/install_venv.py`` file into the virutalenv.
+``requirements.txt`` file and also those listed in the
+``test-requirements.txt`` file into your virtualenv. There will
+also be some additional packages (pip, setuptools, greenlet) that are
+installed by the ``tools/install_venv.py`` file into the virutalenv.
 
 If all goes well, you should get a message something like this::