diff --git a/templates/addtag.html b/templates/addtag.html
index 0c64a3f..9e0b831 100644
--- a/templates/addtag.html
+++ b/templates/addtag.html
@@ -1,6 +1,6 @@
 <!DOCTYPE html>
 <html lang="en">
-   <script src="/socket.io.js" ></script>
+   <script src="/socket.io.js" integrity="sha512-q/dWJ3kcmjBLU4Qc47E4A9kTB4m3wuTY7vkFJDTZKjTs8jhyGQnaUrxa0Ytd0ssMZhbNua9hE+E7Qv1j+DyZwA==" crossorigin="anonymous"></script>
    <script type="text/javascript" charset="utf-8">
         var socket = io();
         var user = {{ user }}
