diff --git a/tox.ini b/tox.ini
index b580bd7..8cff6ef 100644
--- a/tox.ini
+++ b/tox.ini
@@ -27,7 +27,7 @@ deps =
     collective.checkdocs
 commands =
     python setup.py check --restructuredtext
-    check-manifest -v --ignore sigal/version.py {toxinidir}
+    check-manifest -v --ignore sigal/version.py,.readthedocs.yml {toxinidir}
 
 [testenv:doc]
 whitelist_externals = make