diff --git a/library/Paybox/System.php b/library/Paybox/System.php
index 49527f9..1cee167 100644
--- a/library/Paybox/System.php
+++ b/library/Paybox/System.php
@@ -210,7 +210,7 @@ class Paybox_System extends Paybox_Config
 	}
 
 	/**
-	 * Define URL parameters as strng to calculate HMAC
+	 * Define URL parameters as string to calculate HMAC
 	 * @param string $withReturnUrl
 	 */
 	public function setUrlParameters($withReturnUrl = '')
@@ -270,7 +270,7 @@ class Paybox_System extends Paybox_Config
 	public function calculateHMAC()
 	{
 		$binKey = pack("H*", $this->KEY);
-		echo "URL_PARAMETERS : ".$this->URL_PARAMETERS;
+		//echo "URL_PARAMETERS : ".$this->URL_PARAMETERS;
 		$this->PBX_HMAC = strtoupper(hash_hmac('sha512', $this->URL_PARAMETERS, $binKey));
 	}