diff --git a/include/config.inc.example b/include/config.inc.example
index 6bb95ab48..bb59e7255 100644
--- a/include/config.inc.example
+++ b/include/config.inc.example
@@ -92,4 +92,9 @@ define ("DEBUGNOALYSS",0);
 // define ("NOALYSS_CAPTCHA",true);
 // When sending an email , the domain of this email must be in comma separated list ,
 // if the list is an empty string then all the domain are allowed
-// define ('ALLOWED_EMAIL_DOMAIN','');
\ No newline at end of file
+// define ('ALLOWED_EMAIL_DOMAIN','');
+// ////////
+// change NOALYSS_URL with your URL , 
+// with NGINX it is needed to set the NOALYSS_URL , it is the default URL of 
+// your installation, example with https://demo.noalyss.eu
+// define ("NOALYSS_URL","https://demo.noalyss.eu");
\ No newline at end of file
diff --git a/include/lib/config_file.php b/include/lib/config_file.php
index 19eee50fc..a320b2017 100644
--- a/include/lib/config_file.php
+++ b/include/lib/config_file.php
@@ -284,13 +284,22 @@ function display_file_config($p_array, $from_setup = 1, $p_os = 1)
     echo PHP_EOL;
     printf("define ('SESSION_KEY','%s');", generate_random_string(10));
     echo PHP_EOL;
-    printf("// When sending an email , the domain of this email must be in comma separated list ,");
+    printf("// When sending an email, check if you can send with that domain, "
+            . PHP_EOL
+            . "// the domain of this email must be in comma separated list ,");
     echo PHP_EOL;
     print ("// if the list is an empty string then all the domain are allowed");
     echo PHP_EOL;
     printf("// define ('ALLOWED_EMAIL_DOMAIN','');");
     echo PHP_EOL;
-
+    $a=PHP_EOL;
+    echo <<<EOF
+////////$a
+// change NOALYSS_URL with your URL , $a
+// with NGINX it is needed to set the NOALYSS_URL , it is the default URL of $a
+// your installation, example with https://demo.noalyss.eu $a
+// define ("NOALYSS_URL","https://demo.noalyss.eu"); $a
+    EOF;
 }
 /*!
  * \brief create the config file