diff --git a/tox.ini b/tox.ini
index 97ff0cec..efdb1671 100644
--- a/tox.ini
+++ b/tox.ini
@@ -66,6 +66,9 @@ import-order-style = pep8
 application-import-names = keystoneauth1
 
 [testenv:docs]
+setenv =
+    {[testenv]setenv}
+    SPHINX_APIDOC_OPTIONS=noindex,members,undoc-members,show-inheritance
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
     -r{toxinidir}/doc/requirements.txt
@@ -75,6 +78,9 @@ commands =
     sphinx-build -W -b html -d doc/build/doctrees doc/source doc/build/html
 
 [testenv:pdf-docs]
+setenv =
+    {[testenv]setenv}
+    SPHINX_APIDOC_OPTIONS=noindex,members,undoc-members,show-inheritance
 envdir = {toxworkdir}/docs
 deps = {[testenv:docs]deps}
 whitelist_externals =