diff --git a/preparation.sh b/preparation.sh
index 104ff1c..290e233 100644
--- a/preparation.sh
+++ b/preparation.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 echo "Preparation inner"
 kaggle datasets download -d joniarroba/noshowappointments
 !unzip -o noshowappointments.zip