diff --git a/manage.html b/manage.html
index ac0e073b..1ccd87f6 100644
--- a/manage.html
+++ b/manage.html
@@ -212,6 +212,11 @@
              i18n-title="optionsAdvancedNewStyleAsUsercss">
         <input type="checkbox" id="newStyleAsUsercss">
       </label>
+      <a href="https://github.com/openstyles/stylus/wiki/Usercss" i18n-title="externalUsercssDocument">
+        <svg class="svg-icon" viewBox="0 0 20 20">
+          <path d="M4,4h5v2H6v8h8v-3h2v5H4V4z M11,3h6v6l-2-2l-4,4L9,9l4-4L11,3z"/>
+        </svg>
+      </a>
     </a>
   </p>
   <div id="options">