diff --git a/htdocs/public/paypal/newpayment.php b/htdocs/public/paypal/newpayment.php
index 5ba8bb01342..93cb723c19e 100755
--- a/htdocs/public/paypal/newpayment.php
+++ b/htdocs/public/paypal/newpayment.php
@@ -15,6 +15,8 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * For test: https://developer.paypal.com/
  */
 
 /**