diff --git a/nbs/index.ipynb b/nbs/index.ipynb
index fec13fd..b286d12 100644
--- a/nbs/index.ipynb
+++ b/nbs/index.ipynb
@@ -301,8 +301,9 @@
    ],
    "source": [
     "class FS(float):\n",
-    "  def __repr__(self): return f'FS({float(self)})'\n",
+    "    def __repr__(self): return f'FS({float(self)})'\n",
     " \n",
+    "\n",
     "f1 = float(1)\n",
     "FS2 = FS(2)\n",
     "\n",
@@ -457,6 +458,8 @@
     "    def decodes(self, x):\n",
     "        return x * self.std + self.mean\n",
     "\n",
+    "normalize = NormalizeMean()\n",
+    "normalize.setup([1, 2, 3, 4, 5])\n",
     "\n",
     "p = Pipeline((dt, normalize))\n",
     "\n",