diff --git a/00_core.ipynb b/00_core.ipynb
index d24dd9c..9c081f5 100644
--- a/00_core.ipynb
+++ b/00_core.ipynb
@@ -1,14 +1,12 @@
 {
  "cells": [
   {
-   "cell_type": "raw",
+   "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "---\n",
-    "title: core\n",
-    "output-file: core.html\n",
-    "description: Fill in a module description here\n",
-    "---"
+    "# core\n",
+    "\n",
+    "> Fill in a module description here"
    ]
   },
   {