diff --git a/app/index.html b/app/index.html
index 0dffa5f..1e2698b 100644
--- a/app/index.html
+++ b/app/index.html
@@ -27,7 +27,7 @@
 			<h1>Similar Words!</h1>
 			<hr />
 			<h2>Dictionary</h2>
-			<div class="btn-group">
+			<div class="btn-group"  data-toggle="buttons-radio">
 				<button class="btn dict btn-large" data-dict="de">Deutsch</button>
 				<button class="btn dict btn-large" data-dict="en">English</button>
 				<button class="btn dict btn-large" data-dict="it">Italiano</button>