diff --git a/docs/tutorials/fit_simple_neural_radiance_field.ipynb b/docs/tutorials/fit_simple_neural_radiance_field.ipynb
index 33bfa2da..cabeaf8e 100644
--- a/docs/tutorials/fit_simple_neural_radiance_field.ipynb
+++ b/docs/tutorials/fit_simple_neural_radiance_field.ipynb
@@ -257,12 +257,12 @@
     "                sin(2*x[..., i]),\n",
     "                sin(4*x[..., i]),\n",
     "                ...\n",
-    "                sin(2**self.n_harmonic_functions * x[..., i]),\n",
+    "                sin(2**(self.n_harmonic_functions-1) * x[..., i]),\n",
     "                cos(x[..., i]),\n",
     "                cos(2*x[..., i]),\n",
     "                cos(4*x[..., i]),\n",
     "                ...\n",
-    "                cos(2**self.n_harmonic_functions * x[..., i])\n",
+    "                cos(2**(self.n_harmonic_functions-1) * x[..., i])\n",
     "            ]\n",
     "            \n",
     "        Note that `x` is also premultiplied by `omega0` before\n",