diff --git a/package.json b/package.json
index 860ff91f..e76e830f 100644
--- a/package.json
+++ b/package.json
@@ -170,6 +170,7 @@
     "jsonlint": "~1.6.2",
     "less": "~3.9.0",
     "less-loader": "~4.1.0",
+    "markdown-it-ruby": "^0.1.1",
     "mini-css-extract-plugin": "~0.4.1",
     "mocha": "~5.2.0",
     "mock-require": "~3.0.3",
diff --git a/public/docs/features.md b/public/docs/features.md
index b4b92ef7..56647c29 100644
--- a/public/docs/features.md
+++ b/public/docs/features.md
@@ -435,6 +435,7 @@ Subscript: H~2~O
 
 ==Marked text==
 
+{ruby base|rubytext}
 
 ### Blockquotes
 
diff --git a/public/js/extra.js b/public/js/extra.js
index dd827d74..3c7e4a6c 100644
--- a/public/js/extra.js
+++ b/public/js/extra.js
@@ -1001,6 +1001,7 @@ md.use(require('markdown-it-mathjax')({
   afterDisplayMath: '\\]</span>'
 }))
 md.use(require('markdown-it-imsize'))
+md.use(require('markdown-it-ruby'))
 
 md.use(require('markdown-it-emoji'), {
   shortcuts: {}