diff --git a/index.html b/index.html
index c231522..5769561 100644
--- a/index.html
+++ b/index.html
@@ -110,6 +110,10 @@
  <input type="radio" id="laboratory" name="setting" value="laboratory" aria-label="Laboratory">
  <label for="laboratory">Laboratory</label>
 </div>
+<div>
+ <input type="radio" id="library" name="setting" value="library" aria-label="Library">
+ <label for="library">Library</label>
+</div>
 <div>
  <input type="radio" id="social" name="setting" value="social-setting" aria-label="Social setting">
  <label for="social">Social setting</label>