diff --git a/Vakuum/Vakuum.ipynb b/Vakuum/Vakuum.ipynb
index d440759a61bedaed043d1c5c3183e77056cf3249..a98b0f7a7ac4498d9e493e428153c5ba88dc258f 100644
--- a/Vakuum/Vakuum.ipynb
+++ b/Vakuum/Vakuum.ipynb
@@ -183,6 +183,7 @@
    "cell_type": "markdown",
    "id": "6d7d2608-13c8-4244-98f6-978666bfeaba",
    "metadata": {
+    "jp-MarkdownHeadingCollapsed": true,
     "tags": []
    },
    "source": [