diff --git a/js/doc/maps/zebra.js b/js/doc/maps/zebra.js
new file mode 100644
index 0000000..fe7ba5b
--- /dev/null
+++ b/js/doc/maps/zebra.js
@@ -0,0 +1,5 @@
+var colors = Require('doc/colors');
+
+module['exports'] = function (letter, i, exploded) {
+  return i % 2 === 0 ? letter : colors.inverse(letter);
+};