diff --git a/modules/yggdrasill-main.js b/modules/yggdrasill-main.js
index 2237d5a..7b033a4 100644
--- a/modules/yggdrasill-main.js
+++ b/modules/yggdrasill-main.js
@@ -67,10 +67,35 @@ function welcomeMessage() {
   ChatMessage.create({
     user: game.user.id,
     whisper: [game.user.id],
-    content: `<div id="welcome-message-yggdrasill"><span class="rdd-roll-part">Bienvenue !</div>
+    content: `<div id="welcome-message-yggdrasill"><span class="rdd-roll-part"><strong>Bienvenue à Yggdrasill !</strong>
+    <p>Yggdrasill est un Jeu de Rôle publié par 7ième Cercle : https://www.7emecercle.com/7C_site/jeux-de-roles/yggdrasill/</p>
+    <br>Yggdrasill est une propriété de 7ième Cercle.
+    </div>
     ` });
 }
 
+/* -------------------------------------------- */
+// Register world usage statistics
+function registerUsageCount( registerKey ) {
+  if ( game.user.isGM ) {
+    game.settings.register(registerKey, "world-key", {
+      name: "Unique world key",
+      scope: "world",
+      config: false,
+      type: String
+    });
+
+    let worldKey = game.settings.get(registerKey, "world-key")
+    if ( worldKey == undefined || worldKey == "" ) {
+      worldKey = randomID(32)
+      game.settings.set(registerKey, "world-key", worldKey )
+    }
+    // Simple API counter
+    $.ajax(`https://jdr.lahiette.com/fvtt_appcount/count.php?name="${registerKey}"&worldKey="${worldKey}"&version="${game.release.generation}.${game.release.build}"&system="${game.system.id}"&systemversion="${game.system.data.version}"`)
+    /* -------------------------------------------- */
+  }
+}
+
 /* -------------------------------------------- */
 /*  Foundry VTT Initialization                  */
 /* -------------------------------------------- */
@@ -84,7 +109,8 @@ Hooks.once("ready", function () {
       user: game.user._id
     });
   }
-  welcomeMessage();
+  registerUsageCount("fvtt-yggdrasill")
+  welcomeMessage()
 });
 
 /* -------------------------------------------- */