diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index 9e8740754..65b550603 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -1186,8 +1186,8 @@ linebreaks Let MathJax perform automatic linebreaks. Valid values
are \"true\" and \"false\".
indent If align is not center, how far from the left/right side?
multlinewidth The width of the multline environment.
-autonumber How to number equations. Valid values are \"None\",
- \"All\" and \"AMS\".
+autonumber How to number equations. Valid values are \"none\",
+ \"all\" and \"AMS\".
tagindent The amount tags are indented.
tagside Which side to show tags/labels on. Valid values are
\"left\" and \"right\"