1 files changed, 4 insertions, 0 deletions
diff --git a/core/event.php b/core/event.php
index 672146f3..0941acac 100644
--- a/core/event.php
+++ b/core/event.php
@@ -9,6 +9,10 @@ namespace Core;
  * @author  Frederic Guillot
  */
 interface Listener {
+
+    /**
+     * @return boolean
+     */
     public function execute(array $data);
 }