diff --git a/test-requirements.txt b/test-requirements.txt
index cbbbd8483f..4a234b1c42 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,5 @@
 Jinja2
+doc8
 openstack-doc-tools>=0.18.1
 sphinx>=1.1.2,!=1.2.0,<1.3
 oslosphinx
diff --git a/tox.ini b/tox.ini
index 185d6eb1f3..42755ebf01 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,9 @@ commands = {posargs}
 commands = openstack-doc-test --check-links {posargs}
 
 [testenv:checkniceness]
-commands = openstack-doc-test --check-niceness {posargs}
+commands =
+  openstack-doc-test --check-niceness {posargs}
+  doc8 -e .rst -e .txt doc
 
 [testenv:checksyntax]
 commands =