diff --git a/examples/simple.php b/examples/simple.php
index 2527697..768bb10 100644
--- a/examples/simple.php
+++ b/examples/simple.php
@@ -14,7 +14,7 @@ $table->columns([
     'description' => [
         "format" => "html",
         "style" => ["width" => "300px"],
-        "filter" => function () {},
+        "filter" => '',
         "value" => function ($cell) {
             return "<span style='color: sienna'>$cell</span>";
         }