diff --git a/app.php b/app.php
index 12e7ecb..78ed6f1 100644
--- a/app.php
+++ b/app.php
@@ -261,6 +261,8 @@ function($f3) {
             }
         }
 
+        \Flash::instance()->setKey('shareinformations', true);
+
         $f3->reroute($f3->get('REVERSE_PROXY_URL').'/signature/'.$hash.$symmetricKey);
     }
 
diff --git a/templates/signature.html.php b/templates/signature.html.php
index aec596e..650b0c0 100644
--- a/templates/signature.html.php
+++ b/templates/signature.html.php
@@ -272,6 +272,9 @@
     var maxPage = <?php echo $maxPage ?>;
     var sharingMode = <?php echo intval(!isset($noSharingMode)) ?>;
     var pdfHash = null;
+    <?php if(Flash::instance()->getKey('shareinformations')): ?>
+        alert('showinfos');
+    <?php endif; ?>
     var direction = '<?php echo $DIRECTION_LANGUAGE ?>';
     <?php if(isset($hash)): ?>
     pdfHash = "<?php echo $hash ?>";
diff --git a/vendor/fatfree/flash.php b/vendor/fatfree/flash.php
new file mode 100644
index 0000000..3bc2b61
--- /dev/null
+++ b/vendor/fatfree/flash.php
@@ -0,0 +1,105 @@
+<?php
+/**
+ * Flash - A Flash Messages Plugin for the PHP Fat-Free Framework
+ *
+ * The contents of this file are subject to the terms of the GNU General
+ * Public License Version 3.0. You may not use this file except in
+ * compliance with the license. Any of the license terms and conditions
+ * can be waived if you get permission from the copyright holder.
+ *
+ * Copyright (c) 2020 ~ ikkez
+ * Christian Knuth <ikkez0n3@gmail.com>
+ * https://github.com/ikkez/F3-Sugar/
+ *
+ * @version 1.0.2
+ * @date: 13.12.2020
+ * @since: 21.01.2015
+ **/
+
+class Flash extends \Prefab {
+
+	/** @var \Base */
+	protected $f3;
+
+	/** @var array */
+	protected $msg;
+
+	/** @var array */
+	protected $key;
+
+	/**
+	 * Flash constructor.
+	 * @param string $key
+	 */
+	public function __construct($key='flash') {
+		$this->f3 = \Base::instance();
+		$this->msg = &$this->f3->ref('SESSION.'.$key.'.msg');
+		$this->key = &$this->f3->ref('SESSION.'.$key.'.key');
+	}
+
+	/**
+	 * add a message to the stack
+	 * @param $text
+	 * @param string $status
+	 */
+	public function addMessage($text,$status='info') {
+		$this->msg[] = ['text'=>$text,'status'=>$status];
+	}
+
+	/**
+	 * dump all messages and clear them
+	 * @return array
+	 */
+	public function getMessages() {
+		$out = $this->msg;
+		$this->clearMessages();
+		return $out ?: [];
+	}
+
+	/**
+	 * reset message stack
+	 */
+	public function clearMessages() {
+		$this->msg = [];
+	}
+
+	/**
+	 * check if there messages in the stack
+	 * @return bool
+	 */
+	public function hasMessages() {
+		return !empty($this->msg);
+	}
+
+	/**
+	 * set a flash key
+	 * @param $key
+	 * @param bool $val
+	 */
+	public function setKey($key,$val=TRUE) {
+		$this->key[$key] = $val;
+	}
+
+	/**
+	 * get and clear a flash key, if it's existing
+	 * @param $key
+	 * @return mixed|null
+	 */
+	public function getKey($key) {
+		$out = NULL;
+		if ($this->hasKey($key)) {
+			$out = $this->key[$key];
+			unset($this->key[$key]);
+		}
+		return $out;
+	}
+
+	/**
+	 * check if there's a flash key existing
+	 * @param $key
+	 * @return bool
+	 */
+	public function hasKey($key) {
+		return ($this->key && array_key_exists($key, $this->key));
+	}
+}