diff --git a/index.html b/index.html
index 402fc39..2ec43c6 100644
--- a/index.html
+++ b/index.html
@@ -43,7 +43,7 @@
                     <li class="list-group-item list-group-item-action">
                         <a href="https://kcoj.ntut.com.tw" target="_blank">Kuo Cool Online Judge</a>
                         <br>
-                        <span>重新設計操作流程，打造美好交作業體驗。</span>
+                        <span>重新設計操作流程，打造美好交作業體驗。（<a href="https://github.com/kcoj/KCOJ">Source</a>）</span>
                     </li>
                     <li class="list-group-item list-group-item-action">
                         <a href="/tr" target="_blank">Text Revealer</a>