diff --git a/README.md b/README.md
index c0b9781..d4b4891 100644
--- a/README.md
+++ b/README.md
@@ -34,9 +34,13 @@ Webhook configuration
 Configure a http webserver with PHP to access `event.php` script.
 *https://webhook.deblan.org/event.php* for [gitnet].
 
+### Content Type
+
+Set `application/x-www-form-urlencoded`.
+
 ### Secret
 
 Choose an access key from `accounts.php`.
-If you use [gitnet], the administrator sent you the secret key by email.
+If you use [gitnet], the [administrator](https://gitnet.fr/deblan) sent you the secret key by email.
 
 [gitnet]: https://gitnet.fr/project/gitnet