diff --git a/tox.ini b/tox.ini
index 6d0016c0..35c75aed 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,6 +35,17 @@ deps =
 commands =
     sphinx-build -W -b html -d {envtmpdir}/doctrees .  {envtmpdir}/html
 
+[testenv:{py36,py37,py38,py39}-doctest]
+commands =
+    py36,py37,py38,py39: nosetests -v --with-doctest --doctest-options=+NORMALIZE_WHITESPACE petl -I"csv_py2\.py" -I"db\.py"
+
+[testenv:{py36,py37,py38,py39}-dochtml]
+changedir = docs
+deps =
+    -rrtfd_requirements.txt
+commands =
+    sphinx-build -W -b singlehtml -d {envtmpdir}/doctrees .  _build/singlehtml
+
 [testenv:mysqldb]
 basepython = python2.7
 setenv =