diff --git a/PluginMarket.class.php b/PluginMarket.class.php
index c276f7bcbebadd5e56300d0871de3470ae4ac7e1..83fc31a09edfcc0b476d592a457cd08b49c6ceee 100644
--- a/PluginMarket.class.php
+++ b/PluginMarket.class.php
@@ -83,7 +83,7 @@ class PluginMarket extends StudIPPlugin implements SystemPlugin, HomepagePlugin
 
             if ($follower['security_token']) {
                 $calculatedHash = hash_hmac("sha1", $payload, $follower['security_token']);
-                $header[] = "HTTP_X_HUB_SIGNATURE: ".$calculatedHash;
+                $header[] = "X_HUB_SIGNATURE: ".$calculatedHash;
             }
             $header[] = "Content-Type: application/json";
 
diff --git a/classes/MarketPluginFollower.class.php b/classes/MarketPluginFollower.class.php
index 8f5240875aff53476a24a3bba795265435ade96f..b10d4c01a4da6ae55b51e078094f7d1aa59cbaed 100644
--- a/classes/MarketPluginFollower.class.php
+++ b/classes/MarketPluginFollower.class.php
@@ -2,6 +2,13 @@
 
 class MarketPluginFollower extends SimpleORMap {
 
+    static public function notifyUsers($plugin_id, $type = null)
+    {
+        foreach (self::findByPlugin_id($plugin_id) as $follower) {
+
+        }
+    }
+
     static public function findByUserAndPlugin($user_id, $plugin_id) {
         return self::findOneBySQL("user_id = ? AND plugin_id = ?", array($user_id, $plugin_id));
     }