diff --git a/tox.ini b/tox.ini
index 4ef44981..0d968959 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ setenv =
     PYTHONHASHSEED = 0
 deps =
     sphinx
-    zope.interface  # for doctests
+    zope.interface
 commands =
     sphinx-build -W -b html -d {envtmpdir}/doctrees docs docs/_build/html
     sphinx-build -W -b doctest -d {envtmpdir}/doctrees docs docs/_build/html