diff --git a/index.html b/index.html
index e79a0084..91d6fb95 100644
--- a/index.html
+++ b/index.html
@@ -22,7 +22,7 @@
       <div class="slides">
         <section data-markdown="leetcode-20230106.md">
         </section>
-        <section data-markdown="20230109.md">
+        <section data-markdown="leetcode-20230109.md">
         </section>
       </div>
     </div>
diff --git a/20230109.md b/leetcode-20230109.md
similarity index 100%
rename from 20230109.md
rename to leetcode-20230109.md