diff --git a/README.rst b/README.rst
index 7cf2c1d..06f319b 100644
--- a/README.rst
+++ b/README.rst
@@ -175,7 +175,7 @@ change:
 
 
 Command Line Interface
-=====================
+======================
 
 Use ``markdownify example.html > example.md`` or pipe input from stdin
 (``cat example.html | markdownify > example.md``).
diff --git a/tox.ini b/tox.ini
index 1e137fb..e4f184a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,6 +5,10 @@ envlist = py38
 deps =
 	flake8
 	pytest
+	restructuredtext_lint
+	Pygments
 commands =
 	flake8 --ignore=E501,W503 markdownify tests
 	pytest
+	restructuredtext-lint README.rst
+