diff --git a/lib/isodoc/bipm/html_convert.rb b/lib/isodoc/bipm/html_convert.rb
index 675ff28..85783c7 100644
--- a/lib/isodoc/bipm/html_convert.rb
+++ b/lib/isodoc/bipm/html_convert.rb
@@ -39,6 +39,20 @@ def ol_attrs(node)
                               start: node["start"]), style: style, class: klass)
       end
 
+      def mathjax(open, close)
+        BIPM_MATHJAX.gsub("OPEN", open).gsub("CLOSE", close)
+      end
+
+      BIPM_MATHJAX = <<~"MATHJAX".freeze
+      <script type="text/x-mathjax-config">
+        MathJax.Hub.Config({
+          "HTML-CSS": { preferredFont: "STIX" },
+          asciimath2jax: { delimiters: [['OPEN', 'CLOSE']] }
+       });
+      </script>
+      <script src="#{MATHJAX_ADDR}?config=MML_HTMLorMML-full" async="async"></script>
+      MATHJAX
+
       include BaseConvert
       include Init
     end