diff --git a/board.html b/board.php
similarity index 100%
rename from board.html
rename to board.php
diff --git a/index.html b/index.php
similarity index 100%
rename from index.html
rename to index.php
diff --git a/navigation.php b/navigation.php
index 17f5967..4fed91b 100644
--- a/navigation.php
+++ b/navigation.php
@@ -1,7 +1,7 @@
  <?php
 echo '<ul>
-    <li><a href="ticket.html">Ticket</a></li>
-    <li><a href="board.html">Board</a></li>
-    <li><a class="active" href="index.html">Home</a></li>
+    <li><a href="ticket.php">Ticket</a></li>
+    <li><a href="board.php">Board</a></li>
+    <li><a class="active" href="index.php">Home</a></li>
   </ul>';
 ?>
diff --git a/ticket.html b/ticket.php
similarity index 100%
rename from ticket.html
rename to ticket.php