diff --git a/tox.ini b/tox.ini
index e75acd91e..ab8e37124 100644
--- a/tox.ini
+++ b/tox.ini
@@ -148,7 +148,7 @@ commands =
   # TODO(cdent): Get rid of the leading '-' after all the existing
   # routes have been documented. It causes the non-zero exit code to
   # ignored.
-  - python tools/placement_api_docs.py placement-api-ref/source/index.rst
+  - python tools/placement_api_docs.py placement-api-ref/source/
   rm -rf placement-api-ref/build
   sphinx-build -W -b html -d placement-api-ref/build/doctrees placement-api-ref/source placement-api-ref/build/html