diff --git a/src/index.html b/src/index.html
index ccfacc9..511f363 100644
--- a/src/index.html
+++ b/src/index.html
@@ -215,7 +215,7 @@ <h2></h2>
                     </div>
 
                     <div class="rang_wrapper">
-                        <input class="" id="username" autocomplete="given-name" placeholder="username" required />
+                        <input class="" id="username" autocomplete="given-name" placeholder="username" maxlength="15" required />
 
                         <hr class="sepperator hidden" />